Via NBC:  

A Chicago Police officer was shot Thursday evening, fire officials confirmed. 

The shooting occurred at E 18th St and Calumet Parkway shortly after 8 p.m., according to the Chicago Fire Department.The officer was taken to Northwestern Memorial Hospital, authorities said.  

CPD spokesperson Anthony Guglielmi ‏tweeted that the officer was shot in the lower body.

Authorities did not release any further information on the officer's condition or the circumstances leading up to the shooting. 

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Update:

Via Chicago Tribune

An attacker may also have been shot, a source said.

Officers were believed to have spotted a man in or near Battle of Fort Dearborn Park and approached him because they suspected he was drinking, and when he was asked to show identification, he instead took out a gun and shot the officer, a source said, citing preliminary information.