Police say four men were on board an Oshawa-bound GO train early this morning when around 12:30 am, they managed to pry open the doors of a coach, and jumped just west of Danforth station.
One man was seriously injured. He's currently in hospital under police custody.
A Metrolinx spokesperson told 680 News prying open the doors of a moving GO train takes a considerable amount of force.
No names have been released.
The CBC has more details.