Colburn was placed on administrative leave pending the investigation, Monroe said.
Shortly after the exchange on Saturday, a man with lacerations to his face was dropped off by the sedan at McKean Avenue and Presstman Street. Police said they believe the man was inside the sedan during the shooting of the 18-year-old, and that his lacerations were from broken glass. The man has been taken to an area hospital for treatment.
The shootings occurred near where Freddie Gray was taken into custody four years ago. The 18-year-old remains in a hospital, where he is being treated with a gunshot wound to his side, according to police.