Calgary Police had to close a section of the downtown core in the area of Centre Street Wednesday morning after a pedestrian was hit by a vehicle.

At just before 7 a.m., crews were called to the area of Centre Street and 9 Avenue after a man was struck by a commuter bus from Airdrie.

EMS confirmed that they transported a man in his 70s in life-threatening condition from the scene to hospital.

Traffic is being detoured from the area and commuters are advised to take an alternate route if they can.

Sgt. Joerg Gottschling with the Traffic Section says the man who was struck was working a night shift in the area and was on his way home.

"Witnesses say he was wearing all dark clothing and he was walking against the pedestrian signal on 9 Avenue. He made it most of the way across the road but, because of his dark clothing, he was hard to see."

There was just one person on the bus at the time, as well as the driver. Neither was injured.

Gottschling says the victim suffered a severe head injury as a result of the incident.

Traffic had to be detoured around the area for about an hour and half following the crash.