An 18-year-old was found unconscious with an injured back, and four other youths were left cut and bruised, after a party organised on Facebook got out of control on Friday night.

At least five people were assaulted and four people robbed of their mobile phones during the Springvale party, attended by “a large number” of youths, police said.

Dandenong CIU detective Sergeant Luke Kirton said police were called to the party on Springvale Reserve, at the intersection of Ericksen St and Newcomen Rd, after a brawl spilt out on to the street about 11.20pm.

Sgt Kirton said many people were struck by thrown bottles and other projectiles.

“Police attended in large numbers and the crowd dispersed as a result,” he said.

“Three victims were located then, including one that was unconscious.