A group of teenagers hurled bricks and lumps of concrete at cars parked outside a property in Girrawheen early this morning after they were caught peering inside the vehicles.

Police say visitors at the house on Girrawheen Avenue noticed the group of about six teenagers looking through the windows of the cars about 1.30am.

When they investigated, the teenagers armed themselves with star pickets, bricks and pieces of a broken concrete paver and attacked the visitors and damaged five of the parked cars.

Three men aged between 20 and 60 were taken to Royal Perth Hospital with cuts and bruises on their heads and bodies after being struck by projectiles.

Camera Icon Gashaw Beyene, with his wife Ne Wakeyo, in hospital after the youths pelted them with concrete and bricks. Credit: Steve Ferrier

Speaking in hospital today, Gashaw Beyene, 49, said his wife and two children who were inside the house had been left terrified by the attack.

Mr Beyene said he had run outside when he heard the commotion but was pelted with lumps of concrete.

“I don’t know where this has come from,” he said.

Camera Icon Damage to one of the cars. Credit: The West Australian

“I don’t know these people. I said to them, ‘Just get out’, and grabbed a stick.

“I was trying to save my family first, I didn’t care about me.”

Mr Beyene’s two friends, who were also injured, were released from hospital yesterday.

Neighbours said the rampage was frightening.

Camera Icon Forensic police examine cars which were damaged when a group of youths allegedly picked up star pickets, bricks and rocks and began smashing the windows of several vehicles. Credit: Danella Bevis

Barry Scrivens was woken as the teenagers were “smashing up” cars and launching bricks over the fence of the house.

“It was absolutely ferocious and chaotic,” he said.

“I have never seen anything like it.

“It’s the scariest thing I’ve ever seen in my life.”

Police are hunting for the group of teenagers responsible.

Crime Stoppers 1800 333 000 or www.crimestopperswa.com.au