Iraqi protesters set fire to the entrance of a shrine in the southern holy city of Najaf on Saturday and security forces fired tear gas to disperse them, police and a demonstrator at the scene said, risking more bloodshed after a rare day of calm. The demonstrator sent a video to Reuters of a doorway to the Hakim shrine blazing as protesters cheered and filmed it on their mobile phones. The incident took place during one of the bloodiest weeks of Iraq’s anti-government unrest, which erupted last month.