A young Palestinian supporter of Hamas drags a burning tire during clashes following a protest against Israel's military operations in the Gaza Strip, in the West Bank city of Hebron, Friday Jan. 16, 2009. The U.N. chief urged Israel Friday to declare a unilateral cease-fire in Gaza, but Israel rebuffed the idea as its diplomats headed for Egypt and the United States in what appeared to be a final push toward a truce.