FERGUSON, Mo. (AP) — Police on Thursday defended the use of tear gas and smoke bombs to repel protesters after another night of chaos in a St. Louis suburb following the shooting of unarmed 18-year-old Michael Brown.St. Louis County police spokesman Brian Schellman said officers on Wednesday night tossed tear gas to disperse a large crowd of protesters after some threw Molotov cocktails and rocks at officers. More than 10 people were arrested in Ferguson.“In talking to these guys, it is scary,” Schellman said of officers on the front lines of the protest. “They hear gunshots going off, and they don’t know where they’re coming from.”The police response is drawing criticism from many circles.