The Civilian Office of Police Accountability is investigating Saturday morning after a shootout between two people and an off-duty Chicago police officer in South Loop. The shooting happened just before 4 a.

An off-duty police officer was shot at and returned fire on a suspect in the South Loop, the Civilian Office of Accountability reported. Around 3:45 a.m., the officer said she saw two suspects approach a 25-year-old man on a sidewalk near the 100 block of West Polk Street.

An investigation has been launched following an off-duty officer-involved shooting in South Loop early Saturday morning.

A man, 25, was on the sidewalk in the first block of West Polk Street at 3:45 a.m. when two people approached him, police said. A woman, a 25-year-old off-duty CPD officer, approached the group in a car and one of the two people who had approached the man on the sidewalk shot at her before she