The United States criticized the "disgraceful shelling" at a U.N. school in Gaza on Sunday and urged Israel to do more to prevent civilian casualties in its war against Hamas fighters. State Department spokeswoman Jen Psaki also called for an investigation into recent attacks on U.N. schools. "The United States is appalled by today's disgraceful shelling outside an UNRWA school in Rafah sheltering some 3,000 displaced persons, in which at least ten more Palestinians were tragically killed," Psaki said in a statement. The death toll from Israel's three-week military campaign on Gaza has reached 1,766 Palestinians according to medics. The United Nations says more than 80 percent of that number was civilians, including 329 children. This story was edited by Ahram Online* http://english.ahram.org.eg/News/107655.aspx