The Brief

CHICAGO - A Chicago police officer was shot and killed unintentionally by a fellow officer Thursday night during a foot chase on the city’s South Side, according to authorities.

What we know:

The incident began around 9:50 p.m. when officers from the 6th District Tactical Team attempted to stop a male suspect in the 8200 block of South Drexel Avenue. Police say the suspect fled into a nearby building, prompting officers to pursue him inside.

Inside the residence, officers encountered the suspect armed with a rifle. During the confrontation, a Chicago police officer fired shots, striking 36-year-old Officer Krystal Rivera.

The suspect ran from the residence but was later taken into custody. Three firearms were recovered at the scene.

Rivera suffered a gunshot wound to th

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