CHICAGO — Police are looking for Red Line riders who they said hit people on train platforms during two incidents last week.

The riders opened side operator windows in the train and hit CTA riders standing on the platform as the train began to leave, according to a Chicago Police community alert.

The incidents occurred:

4:45 p.m. Thursday at the State and Grand Station

7:46 p.m. Friday at the Sheridan Station

On Tuesday night, police released images of people they said participated in or saw the incidents.

The attackers were described as 18- to 20-year-old riders who were 5-foot-7 to 5-foot-10 and 160-190 pounds, police said.

Anyone with information about the incidents was asked to call police at 312-747-8380.