Police are looking for a gang of young people who allegedly attacked a 19-year-old motorcyclist on Thursday night.
The motorbike rider was travelling out the front of Perth Train Station when he was struck in the throat and dragged to the ground by a piece of rope tied across the road at about 11.30pm.
He dragged himself onto a paved area in front of the train station and was then surrounded by the group of youngsters, police said.
One of the gang then allegedly hit the motorcyclist over the head with a glass bottle.
The victim was taken to Royal Perth Hospital for treatment to cut to his head and rope burns to his neck.
The ABC has named the victim as Lawson Mills, who said he didn't see the rope until it was too late.
He said he believed the group included children as young as 13 or 14.
"One of the ends of the rope hadn't quite been tied down properly so I managed to ride through it," he told the ABC.
"But the rope wrapped around my neck and slowed me down, pulling me off to the side of the road."
He said he asked transit guards at the train station for help, but they didn't do anything before witnesses came to his aid.
Mills said he was angry at the group.
"If I had anything to say to them I'd say to 'pull your head in. What are you doing?'," he told the ABC.
"Your actions have consequences and if you have a bit of decency go and speak to someone about this. Sort yourself out."