One man was rushed to hospital Friday morning, after an assault at the Rundle CTrain Station.
Emergency crews responded to the station, located in the 2500 block of 36 Street N.E., at around 3:30 a.m.
EMS said the victim, a 36-year-old man, was found unconscious and taken to hospital in life-threatening condition.
In a Saturday news release, police said his condition has since been upgraded to critical but stable.
When they arrived, police taped off the crime scene and began reviewing CCTV footage to determine what happened.
Investigators believe that the man was assaulted sometime between 2:30 a.m. and 3:30 a.m., but are still working to determine what happened, a news release said Saturday.
Police said two suspects were taken into custody as persons of interest but have since been released.
The investigation caused the temporary closure of northbound 36 Street N.E.
– With files from Lisa MacGregor