CHICAGO - A Chicago police officer has filed a federal civil rights lawsuit against the city and several colleagues, alleging he was racially harassed and retaliated against after intervening to de-escalate an incident involving a pregnant woman.

Chicago police lawsuit

What we know:

According to the filing, the incident happened March 17, when Banks stepped in as officers confronted and bumped into a pregnant woman.

Banks said he attempted to de-escalate the situation, but later that day, he was surrounded inside a police station by several fellow officers. The lawsuit claims those officers shouted racial slurs at him and told him to "go back where you came from."

Banks, who is Black, said the encounter escalated to the point that he was blocked from leaving the room, effectively

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