Alors que des sources palestiniennes affirment qu'un cessez-le-feu négocié par l'Égypte sera annoncé sous peu et qu'il entrera en vigueur cette nuit au Proche-Orient, Israël dément de son côté cette information.

Israël n'a pas l'intention d'interrompre ses actions militaires pour l'instant, a précisé un porte-parole du gouvernement israélien sur les ondes de la chaîne américaine CNN.

L'Égypte dit de son côté que les négociations netre les deux parties sont toujours en cours.

Plus tôt, mardi, le président égyptien Mohamed Morsi a déclaré que « la grotesque agression israélienne va cesser aujourd'hui », alors que les pressions diplomatiques s'intensifient.

« Les efforts pour parvenir à un cessez-le-feu entre Palestiniens et Israéliens vont avoir des résultats positifs dans les prochaines heures », a assuré le président égyptien, dont le pays est au coeur des efforts internationaux pour ramener le calme au Proche-Orient.

Les États-Unis doivent entreprendre dans la journée des discussions avec le premier ministre israélien Benyamin Nétanyahou, à Jérusalem, ainsi qu'avec des responsables égyptiens et palestiniens, dont le président de l'Autorité palestinienne Mahmoud Abbas, en Égypte et à Ramallah, dans la bande de Gaza.

Le président américain a décidé de dépêcher sa secrétaire d'État dans la région pour « souligner l'intérêt américain pour une solution pacifique qui protège et augmente la sécurité d'Israël et la sécurité régionale »

Au Caire, le secrétaire général de l'ONU, Ban Ki-moon, a appelé toutes les parties « à cesser le feu immédiatement », précisant que « toute nouvelle escalade mettrait toute la région en péril ». Ban Ki-moon doit par ailleurs rencontrer le chef du gouvernement israélien mardi.

Mme Clinton et M. Ban ne sont pas les seuls à se rendre dans la région pour offrir leur soutien et demander aux deux parties de mettre « immédiatement » un terme aux hostilités.

Le ministre turc des Affaires étrangères, Ahmet Davutoglu, est à Gaza mardi « pour faire comprendre » et « faire sentir aux habitants de Gaza qu'ils ne sont absolument pas seuls ».

Pas de déclaration unanime à l'ONU

Les États-Unis ont bloqué l'adoption à l'ONU une déclaration condamnant l'escalade du conflit entre Israël et les Palestiniens.

L'adoption de cette déclaration devait être unanime. Or, Washington l'a rejetée parce qu'elle ne « traitait pas de la racine du problème [...] ne demandant pas l'arrêt total et immédiat des tirs de roquettes de Gaza sur Israël.

Les images du conflit compilées par nos collègues américains. Attention, certaines photos peuvent choquer.
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  • Smoke rises following an Israeli attack on smuggling tunnels on the border between Egypt and Rafah, southern Gaza Strip, Monday, Nov. 19, 2012. (AP Photo/Eyad Baba)

  • A Palestinian demonstrator holds a poster depicting Israeli Prime Minister Benjamin Netanyahu holding a leashed dog superimposed with the head U.S. President Barack Obama, with illustrations of Israel's separation barrier on the left and the gates of Auschwitz Nazi death camp on the right, during a protest against the Israeli military operations in Gaza Strip, near the West Bank city of Nablus, Monday, Nov. 19, 2012. (AP Photo/Nasser Ishtayeh)

  • The dead body of a Palestinian woman from the Abdel Aal family is pulled out from the rubble after the family house collapsed during an Israeli forces strike in the Tufah neighbourhood, Gaza City, Sunday, Nov. 18, 2012. The Israeli military widened its range of targets in the Gaza Strip on Sunday to include the media operations of the Palestinian territory's Hamas rulers, sending its aircraft to attack two buildings used by both Hamas and foreign media outlets. (AP Photo/Majed Hamdan)

  • A member of the Abdel Aal family is rescued after his family house collapsed during an Israeli forces strike in the Tufah neighbourhood, Gaza City, Sunday, Nov. 18, 2012. The Israeli military widened its range of targets in the Gaza Strip on Sunday to include the media operations of the Palestinian territory's Hamas rulers, sending its aircraft to attack two buildings used by both Hamas and foreign media outlets. (AP Photo/Majed Hamdan)

  • Palestinians carry bodies of members of the Daloo family during their funeral in Gaza City, Monday, Nov. 19, 2012. At least eleven members of the Daloo family were killed on Sunday when an Israeli missile struck the two-story home of the family in a residential area of Gaza City. (AP Photo/Bernat Armangue)

  • The body of 11-month old Ibrahim Daloo is carried by mourners past reporters during a funeral for members of the Daloo family in Gaza City, Monday, Nov. 19, 2012. Eleven members of the Daloo family were killed on Sunday when an Israeli missile struck the two-story home of the family in a residential area of Gaza City. (AP Photo/Hatem Moussa)

  • Palestinians pray over the bodies of farmers Amin Bashir, 40, and Tamer Bashir, 30, during their funeral in Deir Al Balah, central Gaza Strip, Monday, Nov. 19, 2012. The Palestinian civilian death toll mounted Monday as Israeli aircraft struck densely populated areas in the Gaza Strip in its campaign to quell militant rocket fire menacing nearly half of Israel's population. (AP Photo/Adel Hana)

  • Palestinians pray over the bodies of farmers Amin Bashir, 40, and Tamer Bashir, 30, during their funeral in Deir Al Balah, central Gaza Strip, Monday, Nov. 19, 2012. The Palestinian civilian death toll mounted Monday as Israeli aircraft struck densely populated areas in the Gaza Strip in its campaign to quell militant rocket fire menacing nearly half of Israel's population. (AP Photo/Adel Hana)

  • Palestinian mourners carry the body of farmer Amin Bashir, 40, during his funeral in Deir Al Balah, central Gaza Strip, Monday, Nov. 19, 2012. The Palestinian civilian death toll mounted Monday as Israeli aircraft struck densely populated areas in the Gaza Strip in its campaign to quell militant rocket fire menacing nearly half of Israel's population. (AP Photo/Adel Hana)

  • A protester from a student union shouts slogans during a protest outside Israeli Embassy in New Delhi, India, Monday, Nov. 19, 2012. The protest was against the Israeli military operations in Gaza Strip, near the West Bank city of Nablus. (AP Photo/Manish Swarup)

  • A protester from a student union shouts slogans during a protest outside Israeli Embassy in New Delhi, India, Monday, Nov. 19, 2012. The protest was against the Israeli military operations in Gaza Strip, near the West Bank city of Nablus. (AP Photo/Manish Swarup)

  • Protesters from various student unions shout slogans during a protest outside Israeli Embassy in New Delhi, India, Monday, Nov. 19, 2012. The protest was against the Israeli military operations in Gaza Strip, near the West Bank city of Nablus. (AP Photo/Manish Swarup)

  • Smoke trails are seen after ordnance were fired by Palestinian militants from Gaza City towards southern Israel, Monday, Nov. 19, 2012. (AP Photo/Hatem Moussa)

  • Protesters from various student unions shout slogans during a protest outside Israeli Embassy in New Delhi, India, Monday, Nov. 19, 2012. The protest was against the Israeli military operations in Gaza Strip, near the West Bank city of Nablus. (AP Photo/Manish Swarup)

  • Smoke and fire are seen from an explosion by a high rise housing media organizations in Gaza City, Monday, Nov. 19, 2012. It's the Israel's military second strike on the building in two days. The Hamas TV station, Al Aqsa, is located on the top floor. (AP Photo/Hatem Moussa)

  • Pakistani students light candles to condemn the Israeli offensive in Gaza in Karachi, Pakistan, Monday, Nov. 19, 2012. (AP Photo/Shakil Adil))

  • Smoke is seen from an explosion by a high rise housing media organizations in Gaza City, Monday, Nov. 19, 2012. It's the Israel's military second strike on the building in two days. The Hamas TV station, Al Aqsa, is located on the top floor. (AP Photo/Hatem Moussa)

  • Smoke and fire are seen from an explosion by a high rise housing media organizations in Gaza City, Monday, Nov. 19, 2012. It's the Israel's military second strike on the building in two days. The Hamas TV station, Al Aqsa, is located on the top floor. (AP Photo/Hatem Moussa)

  • A Palestinian inspects damaged cars following an Israeli air strike in Rafah southern Gaza Strip, Monday, Nov. 19, 2012. (AP Photo/Hatem Omar)

  • Fire is seen from the explosion at a high rise housing media organizations in Gaza City, Monday, Nov. 19, 2012. It's the Israel's military second strike on the building in two days. The Hamas TV station, Al Aqsa, is located on the top floor. (AP Photo/Hatem Moussa)

  • Smoke and fire are seen from the explosion by a high rise housing media organizations in Gaza City, Monday, Nov. 19, 2012. It's the Israel's military second strike on the building in two days. The Hamas TV station, Al Aqsa, is located on the top floor. (AP Photo/Hatem Moussa)

  • Israeli police sappers remove the remains of an ordnance fired by Palestinian militants from the Gaza Strip that landed in the southern Israeli town of Ashkelon, Monday, Nov. 19, 2012. Exchange of fire between Israel and Gaza militants continued for the sixth day on Monday.(AP Photo/Tsafrir Abayov)

  • Palestinians carry injured people after an Israeli strike on a building in Gaza City, Monday, Nov. 19, 2012. It's the Israel's military second strike on the building in two days. Palestinian militant group Islamic Jihad says an Israeli strike on a Gaza media center has killed one of its top militant leaders. (AP Photo/Bernat Armangue)

  • Palestinians firefighters try to extinguish a fire after an Israeli strike on a building of Gaza City, Monday, Nov. 19, 2012. Palestinian militant group Islamic Jihad says an Israeli strike on a Gaza media center has killed one of its top militant leaders. (AP Photo/Bernat Armangue)

  • Palestinians firefighters try to extinguish a fire after an Israeli strike on a building of Gaza City, Monday, Nov. 19, 2012. Palestinian militant group Islamic Jihad says an Israeli strike on a Gaza media center has killed one of its top militant leaders. (AP Photo/Bernat Armangue)

  • Israeli border policemen run during a protest against the Israeli military operations in Gaza Strip near the West Bank city of Nablus, Monday, Nov. 19, 2012. Israeli aircraft struck crowded areas in the Gaza Strip and killed a senior militant with a missile strike on a media center Monday, driving up the Palestinian death toll to 96, as Israel broadened its targets in the 6-day-old offensive meant to quell Hamas rocket fire on Israel. (AP Photo/Nasser Ishtayeh)

  • Israeli women take cover in a stairwell as a siren signals the warning of incoming rockets in the coastal city of Ashkelon, Monday, Nov. 19, 2012. Israeli aircraft struck crowded areas in the Gaza Strip and killed a senior militant with a missile strike on a media center Monday, driving up the Palestinian death toll to 96, as Israel broadened its targets in the 6-day-old offensive meant to quell Hamas rocket fire on Israel. (AP Photo/Tsafrir Abayov)

  • Palestinians remove debris from a building that was damaged after an Israeli strike, in Gaza City, Monday, Nov. 19, 2012. It's the Israel's military second strike on the building in two days. Palestinian militant group Islamic Jihad says an Israeli strike on a Gaza media center has killed one of its top militant leaders. (AP Photo/Bernat Armangue)

  • Palestinians carry an injured man after an Israeli strike on a building, in Gaza City, Monday, Nov. 19, 2012. It's the Israel's military second strike on the building in two days. Palestinian militant group Islamic Jihad says an Israeli strike on a Gaza media center has killed one of its top militant leaders. (AP Photo/Bernat Armangue)

  • Israeli soldiers lie on the ground as an Iron Dome missile is launched near the city of Ashdod, Israel, Monday Nov 19. 2012. Israeli aircraft struck crowded areas in the Gaza Strip and killed a senior militant with a missile strike on a media center Monday, driving up the Palestinian death toll to 96, as Israel broadened its targets in the 6-day-old offensive meant to quell Hamas rocket fire on Israel. (AP Photo/Moti Milrod) ISRAEL OUT

  • PALESTINIAN-ISRAEL-CONFLICT-GAZA

    A Palestinian youth throws a rock at Israeli border gaurds during clashes in the West Bank town of Nablus, on November 18, 2012, as Palestinian across the territories protest against Israel's military action on the Gaza Strip. Israel's Foreign Minister Avigdor Lieberman said that Israel would not negotiate a truce with Gaza Strip's Hamas rulers as long as rocket fire continues from the Palestinian enclave. AFP PHOTO / JAAFAR ASHTIYEH (Photo credit should read JAAFAR ASHTIYEH/AFP/Getty Images)

  • PALESTINIAN-ISRAEL-CONFLICT-GAZA

    A Palestinian stone thrower jumps as tear gas is fired by Israeli soldiers during clashes in the West Bank town of Nablus, on November 18, 2012, as Palestinian across the territories protest against Israel's military action on the Gaza Strip. Israel's Foreign Minister Avigdor Lieberman said that Israel would not negotiate a truce with Gaza Strip's Hamas rulers as long as rocket fire continues from the Palestinian enclave. AFP PHOTO / JAAFAR ASHTIYEH (Photo credit should read JAAFAR ASHTIYEH/AFP/Getty Images)

  • ISRAEL-PALESTINIAN-CONFLICT-GAZA

    An Israeli soldier smokes a cigarette next to a convey of tanks at an Israeli army deployment area near the Israel-Gaza Strip border as they prepare for a potential ground operation in the Palestinian coastal enclave on November 19, 2012. Israeli air strikes killed 10 Palestinians raising the toll to 87, as Israel pushed raids against Gaza militants into a sixth day amid a flurry of efforts to broker a truce. AFP PHOTO/MENAHEM KAHANA (Photo credit should read MENAHEM KAHANA/AFP/Getty Images)

  • ISRAEL-PALESTINIAN-GAZA-CONFLICT

    Israeli soldiers from a tank squadron check their weapons at an Israeli army deployment area near the Israel-Gaza Strip border on November 19, 2012. The Israeli cabinet gave its green light for the recruitment of up to 75,000 reservists, Channel 2 television said, amid signs that Israel was gearing up for a ground offensive in Gaza. AFP PHOTO / JACK GUEZ (Photo credit should read JACK GUEZ/AFP/Getty Images)

  • ISRAEL-PALESTINIAN-CONFLICT-GAZA

    An Israeli soldier sits on top of a tank at an Israeli army deployment area near the Israel-Gaza Strip border as they prepare for a potential ground operation in the Palestinian coastal enclave on November 19, 2012. Israeli air strikes killed 10 Palestinians raising the toll to 87, as Israel pushed raids against Gaza militants into a sixth day amid a flurry of efforts to broker a truce. AFP PHOTO/MENAHEM KAHANA (Photo credit should read MENAHEM KAHANA/AFP/Getty Images)

  • ISRAEL-PALESTINIAN-CONFLICT-GAZA

    Israeli soldiers wearing 'Talit' (prayer shawls) and 'Tefilin' (phylacteries) conduct morning prayers at an Israeli army deployment area near the Israel-Gaza Strip border as they prepare for a potential ground operation in the Palestinian coastal enclave on November 19, 2012. Israeli Prime Minister Benjamin Netanyahu said that Israel is ready to 'significantly expand' its operation against militants in the Hamas-run Gaza Strip as it entered its sixth day. AFP PHOTO/MENAHEM KAHANA (Photo credit should read MENAHEM KAHANA/AFP/Getty Images)

  • Israeli Troops Continue To Gather On Border As UN Call For Truce

    ISRAEL/GAZA BORDER, ISRAEL- NOVEMBER 19: (ISRAEL OUT) An Israeli soldier sits in his tank in a deployment area on November 19, 2012 on Israel's border with the Gaza Strip. The death toll has risen to at least 85 killed in the air strikes, according to hospital officials, on day six since the launch of operation 'Pillar of Defence.' (Photo by Uriel Sinai/Getty Images)

  • ISRAEL-PALESTINIAN-CONFLICT-GAZA

    An Israeli soldier sleeps on top of a tank at an Israeli army deployment area near the Israel-Gaza Strip border as they prepare for a potential ground operation in the Palestinian coastal enclave on November 19, 2012. Israeli air strikes killed 10 Palestinians raising the toll to 87, as Israel pushed raids against Gaza militants into a sixth day amid a flurry of efforts to broker a truce. AFP PHOTO/MENAHEM KAHANA (Photo credit should read MENAHEM KAHANA/AFP/Getty Images)

  • ISRAEL-PALESTINIAN-GAZA-CONFLICT

    An Israeli soldier from a tank squadron wearing 'Talit' (prayer shawls) prays on top of a tank in an Israeli army deployment area near the Israel-Gaza Strip border on November 19, 2012. The Israeli cabinet gave its green light for the recruitment of up to 75,000 reservists, Channel 2 television said, amid signs that Israel was gearing up for a ground offensive in Gaza. AFP PHOTO / JACK GUEZ (Photo credit should read JACK GUEZ/AFP/Getty Images)

  • Israeli Troops Continue To Gather On Border As UN Call For Truce

    ISRAEL/GAZA BORDER, ISRAEL- NOVEMBER 19: (ISRAEL OUT) An Israeli soldier walks in a deployment area on November 19, 2012 on Israel's border with the Gaza Strip. The death toll has risen to at least 85 killed in the air strikes, according to hospital officials, on day six since the launch of operation 'Pillar of Defence.' (Photo by Uriel Sinai/Getty Images)

  • Israeli Troops Continue To Gather On Border As UN Call For Truce

    ISRAEL/GAZA BORDER, ISRAEL- NOVEMBER 19: An Israeli soldier on route to the border with Gaza gestures a victory sign on November 19, 2012 on Israel's border with the Gaza Strip. The death toll has risen to at least 85 killed in the air strikes, according to hospital officials, on day six since the launch of operation 'Pillar of Defence.' (Photo by Christopher Furlong/Getty Images)

  • Israeli Troops Continue To Gather On Border As UN Call For Truce

    ISRAEL/GAZA BORDER, ISRAEL- NOVEMBER 19: Israeli soldiers prepare an artillery emplacement overlooking Gaza on November 19, 2012 on Israel's border with the Gaza Strip. The death toll has risen to at least 85 killed in the air strikes, according to hospital officials, on day six since the launch of operation 'Pillar of Defence.' (Photo by Christopher Furlong/Getty Images)

  • Israeli Troops Continue To Gather On Border As UN Call For Truce

    ISRAEL/GAZA BORDER, ISRAEL- NOVEMBER 19: Israeli soldiers prepare an artillery emplacement overlooking Gaza on November 19, 2012 on Israel's border with the Gaza Strip. The death toll has risen to at least 85 killed in the air strikes, according to hospital officials, on day six since the launch of operation 'Pillar of Defence.' (Photo by Christopher Furlong/Getty Images)

  • PAKISTAN-ISRAEL-PALESTINIANS-PROTEST

    Supporters of Pakistani cricketer turned politician Imran Khan of Pakistan Tehreek-i-Insaaf (PTI - Movement for Justice) carry placards during an anti-Israel protest in Islamabad on November 19, 2012. Israeli air strikes killed 13 Palestinians on November 19, hiking the Gaza death toll to 91 as global efforts to broker a truce to end the worst violence in four years gathered pace. AFP PHOTO/Aamir QURESHI (Photo credit should read AAMIR QURESHI/AFP/Getty Images)

  • PALESTINIAN-ISRAEL-GAZA-CONFLICT

    Israeli soldiers look on a as Palestinian students from the Birzeit University clash with Israeli soldiers at the Atara checkpoint close to the university as they protest against Israel's military action on the Gaza Strip, on November 19, 2012. Israeli air strikes across the Gaza Strip killed 13 people, raising the Palestinian death toll to 90 as Israel's relentless air campaign entered its sixth day. AFP PHOTO / ABBAS MOMANI (Photo credit should read ABBAS MOMANI/AFP/Getty Images)

  • Israeli Troops Continue To Gather On Border As UN Call For Truce

    ISRAEL/GAZA BORDER, ISRAEL - NOVEMBER 19: A man sits on a discarded armchair on a hill overlooking Gaza as Israeli forces continue to bombard Gaza on November 19, 2012 on Israel's border with the Gaza Strip. The death toll has risen to at least 85 killed in the air strikes, according to hospital officials, on day six since the launch of operation 'Pillar of Defence.' (Photo by Christopher Furlong/Getty Images)

  • PAKISTAN-ISRAEL-PALESTINIANS-PROTEST

    Pakistani activists of Islami Jamiat-e-Tulaba (IJT), a student wing of fundamentalist party Jamaat-i-Islami (JI), shout anti-Israel slogans during a protest in Karachi on November 19, 2012. Israeli air strikes killed 13 Palestinians on November 19, hiking the Gaza death toll to 91 as global efforts to broker a truce to end the worst violence in four years gathered pace. AFP PHOTO/Rizwan TABASSUM (Photo credit should read RIZWAN TABASSUM/AFP/Getty Images)

  • PALESTINIAN-ISRAEL-GAZA-CONFLICT

    A dog hides in his kennel as a Birzeit University Palestinian student holding rocks looks towards clashes with Israeli soldiers at the Atara checkpoint close to the university as they protest against Israel's military action on the Gaza Strip, on November 19, 2012. Israeli air strikes across the Gaza Strip killed 13 people, raising the Palestinian death toll to 90 as Israel's relentless air campaign entered its sixth day. AFP PHOTO / ABBAS MOMANI (Photo credit should read ABBAS MOMANI/AFP/Getty Images)

  • Israeli Troops Continue To Gather On Border As UN Call For Truce

    ISRAEL/GAZA BORDER, ISRAEL - NOVEMBER 19: A plume of smoke rises above Gaza City after an Israeli airstrike on November 19, 2012 on Israel's border with the Gaza Strip. The death toll has risen to at least 85 killed in the air strikes, according to hospital officials, on day six since the launch of operation 'Pillar of Defence.' (Photo by Christopher Furlong/Getty Images)

  • PALESTINIAN-ISRAEL-GAZA-CONFLICT

    Birzeit University students takes cover behind the university's sign during clashes with Israeli soldiers at the Atara checkpoint close to the university as they protest against Israel's military action on the Gaza Strip, on November 19, 2012. Israeli air strikes across the Gaza Strip killed 13 people, raising the Palestinian death toll to 90 as Israel's relentless air campaign entered its sixth day. AFP PHOTO / ABBAS MOMANI (Photo credit should read ABBAS MOMANI/AFP/Getty Images)

  • PAKISTAN-ISRAEL-PALESTINIANS-PROTEST

    Pakistani activists of Islami Jamiat-e-Tulaba (IJT), a student wing of fundamentalist party Jamaat-i-Islami (JI), shout anti-Israel slogans during a protest in Karachi on November 19, 2012. Israeli air strikes killed 13 Palestinians on November 19, hiking the Gaza death toll to 91 as global efforts to broker a truce to end the worst violence in four years gathered pace. AFP PHOTO/Rizwan TABASSUM (Photo credit should read RIZWAN TABASSUM/AFP/Getty Images)