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A person was shot and critically wounded by a Chicago police officer in the city’s East Side neighborhood Friday afternoon, officials and police sources said.

Authorities said the shooting occurred about 1:45 p.m. in the 11400 block of South Avenue G near Eggers Grove near the state line. The Civilian Office of Police Accountability initially said the shooting occurred in the 3800 block of East 112th Street.

In a statement, Chicago police said an officer with the South Chicago District and a Forest Preserves of Cook County police officer responded to a call of a male armed with a knife chasing someone.

Upon arrival, the city officer was approached by a male wielding a knife who “then quickly advanced toward” the officer, according to the statement. Police said the officer attempted to distance himself from the man in an attempt to de-escalate the situation, but that the officer fired a shot.

The man, of unknown age, was struck somewhere on the body and the officers applied a tourniquet before he was transported to the University of Chicago Medical Center and initially reported in critical condition.

The Chicago officer was taken to an area hospital for observation and will be placed on routine administrative duties for at least 30 days, according to police. Police also said they recovered a knife from the scene.

COPA is investigating the circumstances of the shooting.