CHICAGO (CBS) -- An off-duty Chicago police officer was injured Saturday afternoon when Metra train hit an unmarked CPD vehicle at a crossing in Elmwood Park .
Police and Metra officials said an outbound Milwaukee District West Line train hit the officer's unmarked car in the 7700 block of West Grand Avenue around 5:10 p.m.
The officer was taken to the hospital for non-life-threatening injuries.
Metra said eyewitnesses told them the lights and gates at the crossing were functioning at the time of the collision, but the incident remains under investigation.
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