A Palestinian man pictured through a damaged classroom carries a boy as he walks at a United Nations-run school sheltering Palestinians displaced by an Israeli ground offensive, that witnesses said was hit by Israeli shelling, in Jebalya refugee camp in the northern Gaza Strip July 30, 2014. Israeli shelling killed at least 15 Palestinians sheltering in a school in Gaza’s biggest refugee camp on Wednesday, the Health Ministry said, as Egyptian mediators prepared a revised proposal to try to halt more than three weeks of fighting. Some 3,300 Palestinians, including many women and children, were taking refuge in the building in Jebalya refugee camp when it came under fire around dawn, the United Nations Relief and Works Agency (UNRWA) said. An Israeli military spokeswoman said militants had fired mortar bombs from the vicinity of the school and troops shot back in response. The incident was still being reviewed. Israel launched its offensive in response to rocket salvoes fired by Gaza’s dominant Hamas Islamists and their allies. REUTERS/Suhaib Salem (GAZA – Tags: POLITICS CIVIL UNREST CONFLICT)