United Nations Relief and Works Agency (UNRWA) Commissioner-General Pierre Krahenbuhl visits the Palestinian families displaced at an UNRWA school in Rafah in the southern Gaza Strip, on August 17, 2014. The United Nations estimates about 10,000 Palestinian homes were destroyed by the fighting displacing hundreds of thousands of people living in the Palestinian enclave. Photo by Abed Rahim Khatib/Flash90

United Nations Relief and Works Agency (UNRWA) Commissioner-General Pierre Krahenbuhl visits the Palestinian families displaced at an UNRWA school in Rafah in the southern Gaza Strip, on August 17, 2014. The United Nations estimates about 10,000 Palestinian homes were destroyed by the fighting displacing hundreds of thousands of people living in the Palestinian enclave. Photo by Abed Rahim Khatib/Flash90

Palestinian children hold posters outside an UNRWA school during a protest against the killing of children in the Rafah, in the southern Gaza Strip on August 17, 2014. The United Nations estimates about 10,000 Palestinian homes were destroyed by the fighting displacing hundreds of thousands of people living in the Palestinian enclave. Photo by Abed Rahim Khatib/Flash90

A Palestinian girl who has been displaced due to Israeli bombardments, in an UNRWA school in Rafah in the southern Gaza Strip, on August 17, 2014. The United Nations estimates about 10,000 Palestinian homes were destroyed by the fighting displacing hundreds of thousands of people living in the Palestinian enclave. Photo by Abed Rahim Khatib/Flash90

A Palestinian girl who has been displaced due to Israeli bombardments, in an UNRWA school in Rafah in the southern Gaza Strip, on August 17, 2014. The United Nations estimates about 10,000 Palestinian homes were destroyed by the fighting displacing hundreds of thousands of people living in the Palestinian enclave. Photo by Abed Rahim Khatib/Flash90

Palestinians who have been displaced due to Israeli bombardments, gather in an UNRWA school in Rafah in the southern Gaza Strip, on August 17, 2014. The United Nations estimates about 10,000 Palestinian homes were destroyed by the fighting displacing hundreds of thousands of people living in the Palestinian enclave. Photo by Abed Rahim Khatib/Flash90

Palestinian children who have been displaced due to Israeli bombardments, play in an UNRWA school in Rafah in the southern Gaza Strip, on August 17, 2014. The United Nations estimates about 10,000 Palestinian homes were destroyed by the fighting displacing hundreds of thousands of people living in the Palestinian enclave. Photo by Abed Rahim Khatib/Flash90

Relatives celebrate during a wedding ceremony at a United Nations-run school sheltering displaced Palestinians from the Israeli offensive, in Rafah in the southern Gaza Strip August 17, 2014. Prime Minister Benjamin Netanyahu said on Sunday any deal on Gaza's future had to meet Israel's security needs, warning Hamas it faced "harsh strikes" if it resumed firing into the Jewish state. With a five-day ceasefire due to expire late on Monday, negotiators returned after consultations to Cairo to seek an end to five weeks of hostilities that have killed more than 2,000 people. Photo by Abed Rahim Khatib/Flash90

People gather around a homeless Palestinians Three bride during his wedding ceremony at a United Nations-run school sheltering displaced Palestinians from the Israeli offensive, in Rafah in the southern Gaza Strip August 17, 2014. Prime Minister Benjamin Netanyahu said on Sunday any deal on Gaza's future had to meet Israel's security needs, warning Hamas it faced "harsh strikes" if it resumed firing into the Jewish state. With a five-day ceasefire due to expire late on Monday, negotiators returned after consultations to Cairo to seek an end to five weeks of hostilities that have killed more than 2,000 people. Photo by Abed Rahim Khatib/Flash90

Three brides Palestinians at the wedding ceremony of homeless couples at a United Nations-run school sheltering displaced Palestinians from the Israeli offensive, in Rafah in the southern Gaza Strip on August 17, 2014. Prime Minister Benjamin Netanyahu said on Sunday any deal on Gaza's future had to meet Israel's security needs, warning Hamas it faced "harsh strikes" if it resumed firing into the Jewish state. With a five-day ceasefire due to expire late on Monday, negotiators returned after consultations to Cairo to seek an end to five weeks of hostilities that have killed more than 2,000 people. Photo by Abed Rahim Khatib/Flash90

People gather around a homeless Palestinian bride during her wedding ceremony at a United Nations-run school sheltering displaced Palestinians from the Israeli offensive, in Rafah in the southern Gaza Strip August 17, 2014. Prime Minister Benjamin Netanyahu said on Sunday any deal on Gaza's future had to meet Israel's security needs, warning Hamas it faced "harsh strikes" if it resumed firing into the Jewish state. With a five-day ceasefire due to expire late on Monday, negotiators returned after consultations to Cairo to seek an end to five weeks of hostilities that have killed more than 2,000 people. Photo by Abed Rahim Khatib/Flash90

alestinian groom walking beside his bride in the wedding ceremony of homeless couples at a United Nations-run school sheltering displaced Palestinians from the Israeli offensive, in Rafah in the southern Gaza Strip on August 17, 2014. Prime Minister Benjamin Netanyahu said on Sunday any deal on Gaza's future had to meet Israel's security needs, warning Hamas it faced "harsh strikes" if it resumed firing into the Jewish state. With a five-day ceasefire due to expire late on Monday, negotiators returned after consultations to Cairo to seek an end to five weeks of hostilities that have killed more than 2,000 people. Photo by Abed Rahim Khatib/Flash90

Palestinians who have been displaced due to Israeli bombardments, gather in an UNRWA school in Rafah in the southern Gaza Strip, on August 17, 2014. The United Nations estimates about 10,000 Palestinian homes were destroyed by the fighting displacing hundreds of thousands of people living in the Palestinian enclave. Photo by Abed Rahim Khatib/Flash90

Palestinians displaced shave their hair as they gather in an UNRWA school in Rafah in the southern Gaza Strip, on August 17, 2014. The United Nations estimates about 10,000 Palestinian homes were destroyed by the fighting displacing hundreds of thousands of people living in the Palestinian enclave. Photo by Abed Rahim Khatib/Flash90

Hamas spokesman Sami Abu Zuhri, speaks during a rally attended by members of the Islamist Hamas movement in support of the Hamas delegates who are due to take part in the talks that resumed in Cairo on August 17, 2014 in Rafah in southern Gaza Strip. Egyptian-brokered indirect negotiations between Israel and the Palestinians are taking place during a five-day lull in the fighting which is due to expire at midnight on August 18. Photo by Abed Rahim Khatib/Flash90

Palestinian boys look on from behind a stage where a giant poster is displayed showing a Hamas fighter, during a demonstration attended by members of the Islamist Hamas movement in support of the Hamas delegates who are due to take part in the talks that resumed in Cairo on August 17, 2014 in Rafah in southern Gaza Strip. Egyptian-brokered indirect negotiations between Israel and the Palestinians are taking place during a five-day lull in the fighting which is due to expire at midnight on August 18. Photo by Abed Rahim Khatib/Flash90

Hamas spokesman Sami Abu Zuhri, speaks during a rally attended by members of the Islamist Hamas movement in support of the Hamas delegates who are due to take part in the talks that resumed in Cairo on August 17, 2014 in Rafah in southern Gaza Strip. Egyptian-brokered indirect negotiations between Israel and the Palestinians are taking place during a five-day lull in the fighting which is due to expire at midnight on August 18. Photo by Abed Rahim Khatib/Flash90

Palestinian supporters of the Islamist Hamas movement shout slogans during a demonstration in support of the Hamas delegates who are due to take part in the talks that resumed in Cairo on August 17, 2014 in Rafah in southern Gaza Strip. Egyptian-brokered indirect negotiations between Israel and the Palestinians are taking place during a five-day lull in the fighting which is due to expire at midnight on August 18. Photo by Abed Rahim Khatib/Flash90

Masked Hamas members burn a cut-out of a Star of David during a demonstration of supporters of the Islamist Hamas movement in support of the Hamas delegates who are due to take part in the talks that resumed in Cairo on August 17, 2014 in Rafah in southern Gaza Strip. Egyptian-brokered indirect negotiations between Israel and the Palestinians are taking place during a five-day lull in the fighting which is due to expire at midnight on August 18. Photo by Abed Rahim Khatib/Flash90

Masked Hamas members burn a cut-out of a Star of David during a demonstration of supporters of the Islamist Hamas movement in support of the Hamas delegates who are due to take part in the talks that resumed in Cairo on August 17, 2014 in Rafah in southern Gaza Strip. Egyptian-brokered indirect negotiations between Israel and the Palestinians are taking place during a five-day lull in the fighting which is due to expire at midnight on August 18. Photo by Abed Rahim Khatib/Flash90

Palestinian supporters of the Islamist Hamas movement shout slogans during a demonstration in support of the Hamas delegates who are due to take part in the talks that resumed in Cairo on August 17, 2014 in Rafah in southern Gaza Strip. Egyptian-brokered indirect negotiations between Israel and the Palestinians are taking place during a five-day lull in the fighting which is due to expire at midnight on August 18. Photo by Abed Rahim Khatib/Flash90