Two dead, man arrested after Vic crash

Two teens are dead and a third is fighting for life after a crash involving a suspected stolen car in Melbourne.

A 16-year-old boy and an 18-year-old woman died when the blue Commodore they were in hit another car at Cranbourne just after 4pm on Sunday.

The Commodore is suspected of being stolen and the driver, a 20-year-old man, allegedly tried to flee the scene but was stopped by a passerby and taken to hospital where he remains under police guard.

Police have yet to lay any charges.

A third passenger, a 17-year-old girl, is fighting for life while a fourth, an 18-year-old man, suffered minor injuries.

The driver of the other car, a 39-year-old woman, suffered serious but non-life threatening injuries, while two girls, aged six and nine, escaped with minor injuries.