Police are investigating reports of two incidents outside a licensed premises in Glenelg in the early hours of Sunday morning, according to SA Police.
At 12.30am on Sunday 23 April, police were called to Moseley Square after it was reported a group of people were fighting. On arrival, the group had dispersed and there were no offences reported to police at the time.
Later in the morning at 1.40am police responded to what appears to be a separate unrelated fight.
On arrival, one person was found to have been struck to the head and was treated by paramedics. He was taken to the Flinders Medical Centre for treatment.
Police are still determining those involved in the altercations and are appealing for anyone who may have witnessed the incidents to contact Crime Stoppers on 1800 333 000.