Fist fights broke out between Palestinians loyal to rival Hamas and Fatah during a demonstration in the West Bank city of Ramallah on Tuesday to protest Israel's sealing off of Gaza. Men swung fists at each other in scuffles in downtown Ramallah after youths from the Fatah youth movement tried to break up a protest by the Islamic Hamas. The Fatah men, waving the black and white checkered flag of their movement, waded into the protest by some 150 Hamas activists, and pushed them out of the square, setting off the fistfights. Associated Press TV filmed two men pushing a youth against a car, appearing about to hit him, before others intervened. "We want your head, Zahar," the Fatah loyalists shouted, referring to Mahmoud Zahar, a senior Hamas leader in Gaza.