A teenage boy was taken to hospital with head injuries after reportedly being left unconscious in an assault on Wellington Street yesterday afternoon.
It is understood the victim was knocked out in front of dozens of onlookers after he was felled by a blow to the back of the head about 3pm near Perth train station.
Police confirmed the boy, believed to be 16, had been taken by St John Ambulance to Royal Perth Hospital.
His injuries were not life-threatening and he was expected to be released overnight.
Police are looking for two males, both of whom possibly boarded a bus from the station moments after the attack.
The offenders have been described as aged between 16 and 18 and having dark to olive- coloured skin.
They were wearing light- coloured clothing.
Anyone with information is asked to call Crime Stoppers on 1800 333 000 or police on 13 14 44.