The officer was caught on surveillance video shoving a detained suspect into a door and onto the ground and allegedly hit him while he was handcuffed.
During the fight at a Loop garage with Joseph E. Baskins of Country Club Hills, the Chicago police sergeant pulled his gun. Another man kicked the gun away.
A Lake County sergeant with the sheriff’s office was stopped at Route 83 and Winchester Road about 8 p.m. when a gray 1999 Subaru Outback rear-ended the squad car.
A sergeant with the Metra police department was stabbed in the leg several times Saturday evening after he tried to break up a fight between at least two people at Union Station, officials said.