ST. LOUIS (AP) — The St. Louis County prosecutor’s office says the officer who was critically wounded during a traffic stop is white.

St. Louis County Prosecutor Bob McCulloch on Friday charged 31-year-old Antonio Taylor with three felonies, including assault and weapons charges. He concurred with the police assessment that the shooting was an ambush.

Authorities say the shooting happened earlier Friday after Ballwin officer, who has not been identified, stopped Taylor, who is black, for speeding.

Police say the officer was walking back to his police car to check Taylor’s driving status when Taylor ran up behind the officer and fired three times, hitting the officer at least once.

Police say they don’t yet have a possible motive in the shooting.

The officer remained hospitalized Friday night.