A man in his 60s is in life-threatening condition after he was struck by a TTC bus on Dufferin Street near St. Clair Avenue West at about 1 a.m. on Wednesday.

Police say the man was crossing Dufferin about 50 metres south of St. Clair when the collision occurred. He suffered serious head injuries.

Police have so far been unable to identify the man; he was not carrying identification.

He is described as five feet eight inches tall with grey hair. Police are investigating whether the man was a resident of a nearby rooming house.

All lanes of Dufferin were closed from St Clair Avenue West to MacKay Avenue for the police investigation. The street was reopened to traffic just before 6:30 a.m.

With files from CBC's Trevor Dunn