Police said the man was in an altercation with staff at this bar. (Google Streetview)

Halifax Regional Police say a 54-year-old man who was found unconscious on the street had been in an altercation with staff at a downtown Halifax bar.

The man was found at about 2:15 a.m. Friday when officers responded to a disturbance on Prince Street, just off of Brunswick Street.

Const. Pierre Bourdages, a spokesman for Halifax Regional Police, said the man had a serious head injury and was rushed to the hospital for treatment.

"A follow-up investigation revealed that the man had become involved in an altercation with bar staff that were outside of the Halifax Alehouse," he told CBC News.

"At this time, no charges are anticipated in this incident."

Bourdages said the man had not been inside the bar.

No other details are known. The investigation continues.

The chief of police has linked late-night violence in downtown Halifax with the fact that licensed establishments are permitted to serve drinks until 3:30 a.m.

Police Chief Jean-Michel Blais has called for bars to close at 2 a.m.