Video and other materials from the day undercover police officers and ATF agents shot two men who allegedly attempted to rob them in suburban Country Club Hills were released by Chicago's police watch dog agency on Thursday. WATCH HERE WATCH HEREOne of the ATF agents fired their gun while in the car, shooting one of the suspects, COPA said. A Chicago police officer who was assisting the ATF agents with the operation and witnessed the attempted robbery began a pursuit in an unmarked vehicle of a suspect who fled. Recordings of 911 calls from the incident were also among the materials released by COPA. Another 911 caller told dispatchers "there's a shooting on Martin Court right now, looks like the guy is a cop."