Rome, Italy - Tens of thousands of protesters marched through the Italian capital and eventually clashed with the police as U.S. president George Bush visited with the Pope. Violence erupted as the procession reached it's destination at the popular tourist destination Piazza Navona. Masked, helmeted radicals threw rocks, smoke bombs, flares and other projectiles at police as a helicopter hovered overhead. Several riot police were reported injured and six suspected rioters were taken into custody by snatch squads of plain clothed police officers. A McDonald's restaurant and a bank were also left vandalized.