Nine residents were displaced following a fire at a Biddeford apartment building early Friday.

The fire at 49 Granite St. was first reported around 5:30 a.m., the Biddeford Fire Department said in a news release.

Crews were on the scene within two minutes, the department said, and witnessed flames coming from the second-floor apartment at the back of the building.

The six occupants of the second-floor apartment and three occupants of the first-floor unit evacuated before first responders arrived, the department said. No one was injured.

Fire Chief Larry Best told a reporter that the blaze did not trigger the building’s fire alarm system and it was fortunate that residents woke up in time to escape.

The fire was contained to the second floor, but damage extended throughout the apartment and the roof, the fire department said, displacing all nine residents.

Fire and rescue units from Arundel, Goodwins Mills, Saco and Old Orchard Beach were mobilized in the initial response, the Biddeford department said. The fire was eventually upgraded to an “all-hands” assignment, bringing in off-duty Biddeford personnel as well as units from Kennebunk and Kennebunkport.

First responders cleared the scene around 8 a.m., the Biddeford department said. The cause of the fire is still under investigation.

The Scarborough, Wells and Westbrook fire departments covered local stations during the blaze.

Staff Writer Morgan Womack contributed to this story.