The SIU is investigating the circumstances around the incident. Officials said the man was taken to hospital with serious, but non-life-threatening injuries.
Three investigators and two forensic investigators from the SIU were assigned to the case.
One witness, who did not want to be identified, said they saw an officer run away from a man while shooting at him multiple times. The witness said the officer then tripped to the ground and dropped his gun before other officers moved in and surrounded the man.