Israelis take cover as a siren warning of incoming rockets sounds in the southern city of Ashkelon July 21, 2014. The Palestinian death toll in an Israeli offensive in the Gaza Strip jumped to more than 500 on Monday, as the United States, alarmed by escalating civilian bloodshed, took a direct role in efforts to secure a ceasefire. Non-stop attacks lifted the Palestinian death toll to 518, including almost 100 children, since fighting started on July 8, Gaza health officials said. Israel says 18 of its soldiers have also died along with two civilians. REUTERS/Amir Cohen (ISRAEL – Tags: CONFLICT CIVIL UNREST POLITICS TPX IMAGES OF THE DAY) – RTR3ZK5U

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