DEIR AL-BALAH, Gaza Strip — The U.N. food agency accused Israel of using tanks, snipers and other weapons to fire on a crowd of Palestinians seeking food aid , in what the territory's Health Ministry said was one of the deadliest days for aid-seekers in over 21 months of war. The World Food Program in a statement Sunday condemned the violence that erupted in northern Gaza as Palestinians tried to reach a convoy of trucks carrying food. The Health Ministry in Gaza said at least 80 people were