Gatecrashers stomp on teen's head at Sydney birthday party

A 16-year-old boy remains in a Sydney hospital after being punched and stomped on by gate-crashers at a 16th birthday party.

Police say six to eight uninvited males entered a home in Matraville in Sydney’s east on Friday night and, after refusing to leave, punched a 59-year-old man in the face and assaulted a 32-year-old private security guard.

Other guests became involved in the melee and a 16-year-old boy who was a guest at the party was punched to the ground from behind.

He suffered head injuries when his head and neck were stomped on before the intruders fled, police say.

A 17-year-old boy also suffered facial injuries and received stitches at St Vincent's Hospital.