Iraqi officials say an angry mob has killed a 16-year-old and strung up his corpse by his feet from a traffic pole. They say that’s after the teen shot and killed six people Thursday, including four anti-government protesters. Dozens of people pointed their cell phones at the corpse dangling high above them in a central Baghdad square. Videos circulating on social media showed the young man being beaten and dragged across the street. The violent incident underscored the growing fears and mutual suspicion swirling around the eight-week old protest movement, which engulfed Iraq on Oct. 1 when thousands took to the streets to decry government corruption, poor services and scarcity of jobs.