Stabbing leaves man in critical condition in downtown Calgary

A man is in critical condition after being stabbed in Calgary's downtown core early Thursday morning.
It happened in the 1000 block of First Street S.W. around 1:30 a.m.
It's not clear what led up to the attack, but there were reports that several people fled the scene.
Officers interviewed witnesses at the scene, but many of them were intoxicated and gave conflicting accounts, police say.