Two men, 18 and 22, were taken to hospital overnight after a stabbing inside an apartment building in downtown Ottawa.
It happened at 420 Gloucester St., near Bronson Avenue, at midnight.
The 18-year-old suffered "traumatic injuries," according to paramedics, and was taken to hospital in critical condition.
He remained in hospital in stable condition Saturday morning, police said.
The 22-year-old was also taken to hospital for treatment but was later released.
Ottawa police are investigating.