SAN FRANCISCO (AP) _ A fire broke out Sunday at a historic landmark on Fisherman's Wharf, and raged for hours, destroying the fourth floor and roof, authorities said.

The fire at The Cannery was contained Sunday morning, but about 90 firefighters continued to fight it. ``We're not calling it under control because we still have a lot of heat in the heavy timbers,'' said Capt. Pete Howes.

The fourth floor and roof of the building were destroyed, although the brick facade still stands, Howes said. The building was built around 1907 and was undergoing renovations.

There were no reports of injuries. Most businesses on the wharf were closed when the fire broke out around midnight in a section undergoing renovations, city fire Lt. Eric Richardson said.

Flames had caused burn damage to adjacent buildings.

Fire investigators had not determined a cause.