Palestinian children, who fled their houses during Israeli offensive, play at a United Nations-run school sheltering displaced Palestinians, in Gaza City August 2, 2014. In Israeli southern communities hit by daily rocket and mortar bomb attacks from the Gaza Strip, some residents remained in their shelters, waiting tensely to see if a 72-hour Egyptian-brokered ceasefire that went into effect on Tuesday would hold. REUTERS/Mohammed Salem

A Palestinian woman, who fled her house during an Israeli offensive, stands outside her tent at a United Nations-run school sheltering displaced Palestinians, in Gaza City August 2, 2014. In Gaza, Palestinians who sheltered in U.N.-run schools began returning to towns and villages to examine the widespread damage from four weeks of fierce fighting. REUTERS/Mohammed Salem

Palestinians, who fled their houses during an Israeli offensive, sleep at a United Nations-run school sheltering displaced Palestinians, in Gaza City August 3, 2014. REUTERS/Mohammed Salem

A Palestinian woman, who fled her house during an Israeli offensive, looks after her grandson as they sit in a tent at a United Nations-run school sheltering displaced Palestinians, in Gaza City August 2, 2014. REUTERS/Mohammed Salem

Palestinians, who fled their houses during an Israeli offensive, sleep at a United Nations-run school sheltering displaced Palestinians, in Gaza City August 3, 2014. REUTERS/Mohammed Salem

A Palestinian boy, who fled his house during an Israeli offensive, washes his brother at a United Nations-run school sheltering displaced Palestinians, in Jabaliya refugee camp in the northern Gaza Strip July 31, 2014. REUTERS/Mohammed Salem

Palestinians, who fled their houses during an Israeli offensive, are seen through a tent at a United Nations-run school sheltering displaced Palestinians, in Gaza City August 2, 2014. REUTERS/Mohammed Salem

A Palestinian woman, who fled her house during an Israeli offensive, walks down the stairs inside a United Nations-run school sheltering displaced Palestinians in Gaza City August 2, 2014. REUTERS/Mohammed Salem

Palestinians, who fled their houses during an Israeli offensive, walk into a United Nations-run school sheltering displaced Palestinians, in Gaza City August 2, 2014. REUTERS/Mohammed Salem

Palestinians, who fled their houses during an Israeli offensive, are seen inside a classroom at a United Nations-run school sheltering displaced Palestinians in Jabaliya refugee camp in the northern Gaza Strip August 3, 2014. REUTERS/Mohammed Salem

A Palestinian woman, who fled her house during an Israeli offensive, sits inside a classroom at a United Nations-run school sheltering displaced Palestinians in Jabaliya refugee camp in the northern Gaza Strip August 3, 2014. REUTERS/Mohammed Salem

A Palestinian girl, who fled her house during an Israeli offensive, prepares food inside a classroom at a United Nations-run school sheltering displaced Palestinians, in Gaza City August 2, 2014. REUTERS/Mohammed Salem

Palestinian children, who fled their houses during an Israeli offensive, eat breakfast inside a classroom at a United Nations-run school sheltering displaced Palestinians in Jabaliya refugee camp in the northern Gaza Strip August 3, 2014. REUTERS/Mohammed Salem

Palestinians, who fled their houses during an Israeli offensive, eat breakfast inside a classroom at a United Nations-run school, sheltering displaced Palestinians in Jabaliya refugee camp in the northern Gaza Strip August 3, 2014. REUTERS/Mohammed Salem

A Palestinian woman, who fled her house during an Israeli offensive, prepares food inside a classroom at a United Nations-run school sheltering displaced Palestinians, in Gaza City August 2, 2014. REUTERS/Mohammed Salem

A Palestinian woman, who fled her house during an Israeli offensive, washes her son at a United Nations-run school sheltering displaced Palestinians, in Gaza City July 23, 2014. REUTERS/Mohammed Salem

A Palestinian woman, who fled her house during an Israeli offensive, holds her sleeping son after breakfast inside a classroom at a United Nations-run school sheltering displaced Palestinians in Jabaliya refugee camp in the northern Gaza Strip August 3, 2014. REUTERS/Mohammed Salem

Palestinians, who fled their houses during an Israeli offensive, lie inside a classroom at a United Nations-run school sheltering displaced Palestinians, in Gaza City August 2, 2014. REUTERS/Mohammed Salem

A Palestinian girl, who fled her house during an Israeli offensive, looks out of a classroom window at a United Nations-run school sheltering displaced Palestinians in Jabaliya refugee camp in the northern Gaza Strip August 3, 2014. REUTERS/Mohammed Salem

Israeli children play outside a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen

Chairs stand next to a painted wall inside a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen

Israeli youths play in a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen

An Israeli couple sleeps in a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen

An Israeli couple sleeps in a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen

Israelis sleep on mattresses in a public bomb shelter in the southern city of Ashkelon August 5, 2014. REUTERS/Amir Cohen

An Israeli woman looks inside a fridge as others lie on mattresses in a public bomb shelter in the southern city of Ashkelon August 5, 2014. REUTERS/Amir Cohen

An Israeli girl sweeps the floor as another holds a child in a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen

An Israeli boy arranges dishes in a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen

An Israeli spreads hummus on a slice of bread in a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen

An Israeli girl hangs a drawing on the door of a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen

A mattress lies next to framed pictures inside a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen

A rolled-up poster depicting Israel's Prime Minister Benjamin Netanyahu is seen in a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen

An organ and mattresses are seen inside a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen

An Israeli child sits on the floor of a public bomb shelter in the southern city of Ashkelon August 5, 2014. REUTERS/Amir Cohen

Israelis are seen in a public bomb shelter in the southern city of Ashkelon August 5, 2014. REUTERS/Amir Cohen

An Israeli woman smokes in a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen

Israeli women, members of the Ethiopian community, are seen outside a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen

An Israeli boy runs up the stairs in a public bomb shelter in the southern city of Ashkelon August 4, 2014. REUTERS/Amir Cohen