MoreFrom Gaza to Israel, Innocents Caught in the CrossfirePHOTOS: Israel’s Ground Offensive in GazaAt least 15 people were killed after Israeli forces struck a U.N.-run school sheltering Palestinians in northern Gaza, the Gaza Health Ministry said on Thursday. Another 200 people were wounded in the attack, which marks the fourth time that a UN facility has been hit since Israel began Operation Protective Edge on July 8, the BBC reports. Nearly 750 Palestinians and at least 32 Israeli soldiers have been killed in the fighting, which intensified last week when Israel launched a ground operation to destroy tunnels used by Hamas, the militant group that controls the Gaza Strip, to deploy a regular stream of rockets into Israel. The international community has struggled to broker a cease-fire between Israel and Hamas, even as the United Nations has condemned both sides in the conflict. U.N.