Victim: Manrajwinder Singh

Victim: Manrajwinder Singh

Three teenagers have been arrested over a vicious assault on two men at Birrarung Marr on Sunday.

Manrajwinder Singh, a 20-year-old overseas student from Reservoir, remains in an induced coma after being bashed in an inner-city park about 4.15am.

CCTV footage released by police showed Mr Singh standing with a friend near the footpath at Birrarung Marr park, about 50 metres from St Kilda Road, when they were approached by eight men of African appearance and one fair-skinned woman.

Detective Senior Constable Adam Foley said that after a brief conversation between the group and the two victims, one of the offenders kicked Mr Singh in the jaw, causing him to fall, unconscious, to the ground.

Meanwhile, the others "set upon the other victim, punching and kicking him" before knocking him to the ground.

"While this was occurring, another man picked up a stick and beat the unconscious victim with it," Senior Constable Foley said.

Mr Singh's friend, a 23-year-old Springvale man, suffered swelling and abrasions to his face.

A third friend, who was talking on the phone to a relative at the time of the attack, managed to flee and alert the police.

A PSO at Sunshine railway station arrested a 16-year-old boy just before midnight on Tuesday, after seeing footage of the attack in the media.

The St Albans teen has been charged with serious assault and was remanded in custody.

A Sydenham boy, 17, has been charged with intentionally causing serious injury, robbery and theft.

He faced an out-of-sessions court hearing on Tuesday night and was remanded to appear at a children's court on January 2.

An Ascot Vale boy, 15, has been released and is expected to be charged on summons with assault-related offences. 

Police are searching for five people believed to have been involved in the attack.

Anyone with information is urged to to call Crime Stoppers on 1800 333 000 or visit crimestoppers.com.au