The incident comes after the shooting of a teenager by a police officer in the St. Louis suburb last Saturday. That incident sparked riots and looting over the weekend.
Officials say at about 1 a.m. Wednesday, four men in ski masks armed with shotguns approached a crowd. As police arrived they heard shots firing and saw people running. One officer chased a suspected shooter.
Police told affiliate KTVI an officer shot a man after he allegedly pointed his handgun at him.
The suspect was taken to the hospital in critical condition. Police recovered the suspect’s handgun. The officer was not injured.
In a separate shooting at around 12:20 a.m., a woman was shot in the head in a drive-by shooting on Highmont Dr. in Ferguson. She’s expected to survive. Police are looking for four to five men who were in a white sedan.