A Chicago police officer was shot in the vest after a suspect opened fire during a foot chase in the Gresham neighborhood Tuesday morning, according to police. A tactical officer observed a man "acting suspiciously" around 11 a.m. Tuesday and made a traffic stop near 87th Street and Ashland Avenue, according to CPD Supt. Eddie Johnson. Johnson said police have increased their presence in the area due to a gang conflict. Officers got out of their squad car to question the man, who exited his vehicle and fled on foot. The officers gave chase.