CHICAGO (WLS) -- A Chicago police officer was shot in his vest and two others were injured in an exchange of gunfire on the city's South Side early Sunday, officials said.

Chicago police said officers responded to a disturbance call in the Morgan Park neighborhood's 11400-block of South Davol Street just before 1 a.m.

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Responding officers found a group of people, including two men, 35 and 18 years old, who were involved in an altercation, police said.

Police said as officers tried to separate the men, an offender's gun went off, striking a victim and an officer's protective vest.

Another officer returned fire, striking the offender and accidentally striking the victim, police said.

The victim was transported to the University of

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