A fire in a construction zone of one of the Lockwood mill buildings Friday was mostly contained by the building’s sprinkler’s system but caused the building’s occupants to be relocated.

The Waterville Fire Department responded to an alarm at the Water Street building, which is being renovated into apartments, shortly before 6:30 p.m. When firefighters arrived, an alarm was sounding and the building’s occupants had evacuated.

In a news release issued Sunday, Deputy Chief Dan Brown said water was seen running between floors in the building’s northwest corner, and smoke was found in the stairwell.

A second alarm brought Winslow Fire and Rescue, and crews discovered a smoldering fire in a construction zone on the fifth floor. The building’s sprinkler system largely contained the fire and fire crews found it had not spread.

Only the third floor of the mill building at 6 Water St. is currently occupied. Because of damage caused by water and the fire protection systems being disabled, the occupants were relocated. With the help of the Waterville Housing Authority, they were provided transportation to temporary lodging at a nearby hotel, Brown said.

The mill building, one of three in the Lockwood-Duchess Mill complex, has been undergoing renovation to convert the space into affordable housing.

The fire’s cause is being investigated by the Office of State Fire Marshal. A request for more information was not immediately returned Sunday.