The Chicago Police Department is offering a $10,000 reward for information leading to the arrest of a man who reportedly shot and critically wounded an off-duty officer.

According to Fox News, the 25-year-old officer was driving with a woman in the very early morning on Wednesday when he noticed a black Toyota following him. The couple called 911 before the gunman opened fire, striking the officer in the head. The woman was not hurt.

Related: Off-duty Chicago Officer Shot, Critically Wounded

The officer has undergone surgery and is responding to stimuli. He reportedly even gave hospital visitors a thumbs up.

Chicago PD released an image of the suspect vehicle via Twitter, with the caption, "A $10,000 reward is offered by @cpdmemorial for information leading to the arrest and conviction of offenders responsible for Tuesday’s shooting of the off-duty CPD officer."