sentences:  They threw rocks, set fire to tires to block traffic, torched cars and smashed windshields amid the rattle of gunshots as troops fired into the air to try to disperse the crowds.There were reports of gunfire and pictures showed masked men holding guns and assault-rifles.Hezbollah secretary general Sayyed Hassan Nasrallah went on TV in the evening to tell followers it was a "religious duty" to get off the streets to allow security forces to keep order.