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In this Monday, July 14, 2014 photo, resting in his father's lap after fleeing Israeli airstrikes, Bilal Attar, 4, now shares a classroom in the New Gaza Boys United Nations School in the Gaza Strip with more than a dozen people. In Gaza, about one-fourth of the over 170 Palestinians killed in the past week were children, according to U.N. figures. (AP Photo/Khalil Hamra) ( APTOPIX Mideast Palestinians Gaza Children )

Palestinian children rest at a UN school after evacuating their homes near the border at the Jabaliya refugee camp in the Gaza Strip on July 15, 2014. Israel's security cabinet accepted an Egyptian ceasefire proposal after a week of the deadliest violence in and around Gaza in years, Israeli media reports said. AFP PHOTO/MAHMUD HAMSMAHMUD HAMS/AFP/Getty Images ( 531650727 )

In this Monday, July 14, 2014 photo, resting in his father's lap after fleeing Israeli airstrikes, Bilal Attar, 4, now shares a classroom in the New Gaza Boys United Nations school in the Gaza Strip with more than a dozen people. The children of the Attar clan have lived through three wars in just over five years, each time fleeing their homes as Israel bombarded their neighborhood in the Palestinian Gaza Strip. (AP Photo/Khalil Hamra) ( APTOPIX Mideast Palestinians Third Time Displaced )

Palestinian children wait for the bodies of Sarah Omar el-Eid, 4, her father Omar, 26, and her uncle Jihad, 27, to be brought in a house during their funeral in Rafah, southern Gaza Strip, Tuesday, July 15, 2014. The three were killed by an Israeli strike late Monday. An Egyptian truce proposal for the conflict in Gaza quickly unraveled Tuesday, after the Islamic militant group Hamas rejected the plan.(AP Photo/Lefteris Pitarakis) ( Mideast Israel Palestinians )

An Iranian woman holds portraits of Palestinian children killed in Israeli air strikes during a small protest outside the United Nations offices in Tehran on July 15, 2014 against Israel's deadly air offensive on the Gaza Strip this month. AFP PHOTO/BEHROUZ MEHRIBEHROUZ MEHRI/AFP/Getty Images ( 531653177 )

In this Monday, July 14, 2014 photo, a Palestinian girl sits on the wall of the New Gaza United Nations School, where dozens of families have sought refuge after fleeing their home in fear of Israeli airstrikes. 20 U.N. schools took in more than 17,000 displaced Gazans, many of them children, after Saturday's warnings by Israel that civilians must clear out of northern Gaza. (AP Photo/Khalil Hamra) ( Mideast Palestinians Gaza Children )

Palestinian children take refuge at a UN school after evacuating their homes near the border at the Jabaliya refugee camp in the Gaza Strip on July 15, 2014. Israel's security cabinet accepted an Egyptian ceasefire proposal after a week of the deadliest violence in and around Gaza in years, Israeli media reports said. AFP PHOTO/MAHMUD HAMSMAHMUD HAMS/AFP/Getty Images ( 531650725 )

In this Monday, July 14, 2014 photo, a donkey cart belonging to displaced Palestinians sits parked in front of a mural painted at the New Gaza United Nations School, where dozens of families have sought refuge after fleeing their home in fear of Israeli airstrikes. 20 U.N. schools took in more than 17,000 displaced Gazans, many of them children, after Saturday's warnings by Israel that civilians must clear out of northern Gaza. (AP Photo/Khalil Hamra) ( Mideast Palestinians Gaza Children )

In this Monday, July 14, 2014 photo, a boy cools off on a hot summer day at the Gaza Boys United Nations School, where dozens of families have sought refuge after fleeing their home in fear of Israeli airstrikes. 20 U.N. schools took in more than 17,000 displaced Gazans, many of them children, after Saturday's warnings by Israel that civilians must clear out of northern Gaza. (AP Photo/Khalil Hamra) ( Mideast Palestinians Gaza Children )

In this Monday, July 14, 2014 photo, displaced Palestinians fill empty bottles of water at the New Gaza Boys United Nations School, where dozens of families have sought refuge after fleeing their home in fear of Israeli airstrikes. 20 U.N. schools took in more than 17,000 displaced Gazans, many of them children, after Saturday's warnings by Israel that civilians must clear out of northern Gaza. (AP Photo/Khalil Hamra) ( Mideast Palestinians Gaza Children )

In this Monday, July 14, 2014 photo, the son of Sada Attar lies on the floor of a classroom of the New Gaza Boys United Nations School after his mother fled with his two brothers from their home in fear of Israeli airstrikes. The Attar clan lives in Atatra, a neighborhood in northeastern Gaza, just a few hundred meters from Israel. Gaza militants often launch rockets at Israel from border areas, turning them into flashpoints and frequent targets of Israeli strikes. (AP Photo/Khalil Hamra) ( Mideast Palestinians Gaza Children )

In this Monday, July 14, 2014 photo, a Palestinian family displaced by ongoing violence clean a classroom where they now live in the New Gaza United Nations School, where dozens of families have sought refuge after fleeing their homes in fear of Israeli airstrikes. In Gaza, about one-fourth of the over 170 Palestinians killed in the past week were children, according to U.N. figures. (AP Photo/Khalil Hamra) ( Mideast Palestinians Gaza Children )

In this Monday, July 14, 2014 photo, a boy waits to fill empty bottles with water at the Gaza Boys United Nations School, where dozens of families have sought refuge after fleeing their home in fear of Israeli airstrikes. In Gaza, about one-fourth of the over 170 Palestinians killed in the past week were children, according to U.N. figures. (AP Photo/Khalil Hamra) ( Mideast Palestinians Gaza Children )

In this Monday, July 14, 2014 photo, sisters Mariam Attar, center right, and Sada Attar, center left, rest with their children inside the New Gaza Boys United Nations School after fleeing their home in fear of Israeli airstrikes in Gaza City. The children of the Attar clan have lived through three wars in just over five years, each time fleeing their homes as Israel bombarded their neighborhood in the Palestinian Gaza Strip. (AP Photo/Khalil Hamra) ( Mideast Palestinians Gaza Children )

In this Monday, July 14, 2014 photo, a boy waits at the entrance to a classroom of the New Gaza Boys United Nations School, where his family sought refuge after fleeing their home in fear of Israeli airstrikes. In Gaza, about one-fourth of the over 170 Palestinians killed in the past week were children, according to U.N. figures. (AP Photo/Khalil Hamra) ( Mideast Palestinians Gaza Children )