An officer responding to a large gathering overnight in the South Shore neighborhood was struck by a vehicle while conducting traffic control, Chicago police said. About 2:15 a.m. Friday, officers responded to a large gathering in the 7500 block of South Phillips Avenue and one officer attempting to conduct traffic control was struck by a white sedan that fled east, police said. The officer was struck to the leg, and was treated by paramedics and released. No one was in custody and detectives were investigating.