PITTSBURGH (AP) — Dozens of protesters returned to the streets of downtown Pittsburgh on Tuesday, blocking traffic with locked arms and raised fists, demanding justice in the police killing of 17-year-old Antwon Rose Jr. Chanting, “Who did this? The police did this!” and “Three shots to the back, how do you justify that?” marchers began walking several blocks shortly after 7:30 a.m., shutting down busy intersections for more than two hours.