A man was critically injured after exchanging gunfire with a Tucson police officer around 2 a.m. Sunday, police said. 

Officer Alvaro Silva conducted a traffic stop on a passenger vehicle on the 5100 block of East First Street. After stopping, 23-year-old Antajuan Carson, the driver of the vehicle, immediately fired upon Silva, a 3 1/2-year veteran of the police department. Silva fired back, striking Carson multiple times, according to a news release from the Tucson Police Department. 

A passenger took control of the stopped vehicle and fled the scene near North Rosemont Boulevard and East Speedway Boulevard. Carson was taken to a local hospital with life-threatening injuries. Silva was not injured, according to the news release. 

The police department's Office of Professional Standards is conducting a separate, administrative investigation, which is standard protocol in all officer-involved shootings. The department’s Critical Incident Review Board will evaluate the response to this incident, according to the news release.

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The investigation is ongoing and additional details will be released as they become available.