Chicago police warn residents of armed robberies in Jefferson Park By Sun-Times Media Wire In each incident someone in a dark vehicle pulled up near a person in their vehicle, two people got out, pulled out a gun and announced a robbery, Chicago police said. The robberies happened: About 6:50 p.m Dec. 12 in the 4800 block of North Normandy Avenue; and Abut 8:30 p.m. Dec. 12 in the 4900 block of North Mason Avenue. Anyone with information is asked to contact Area Five detectives at 312-746-7394.