Chicago police Officer Krystal Rivera was mistakenly shot and killed by a fellow cop during a confrontation with an armed suspect, according to police, who continued to hold at least two people in custody as of late Friday.

The department announced Rivera had been struck by friendly fire about a day after she died. She and the Gresham (6th) district tactical team she had been a part of were trying to conduct an investigatory stop in the Chatham neighborhood, police have said, and encountered an armed suspect after chasing a person into an apartment building on the 8200 block of South Drexel Avenue.

An autopsy conducted Friday found that Rivera had died of a gunshot wound to the back.

“As released in yesterday’s preliminary statement, an officer discharged his weapon during the encounter

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