A massive fire that swept through a Yonkers apartment building, displacing about 150 residents, was finally brought under control Wednesday morning, some 12 hours after it started, according to a report.

The four-alarm blaze at the six-story building at 15 Parkview Ave. started about 6 p.m. Tuesday and was extinguished by 6 a.m. Wednesday — but firefighters are expected to remain at the scene throughout the day as officials investigate what sparked it.

More than 100 firefighters battled the conflagration, which caused the top floor to collapse as the flames ravaged the roof, according to WABC.

Rescuers went door to door to search for residents before officials pulled firefighters from inside the building, opting instead to battle the fire from outside.

“It’s quite a shock to come home to it,” resident Arthur Weisenseel told the news outlet. “This is a dramatic scene, to say the least.”

No injuries were reported, according to Mayor Mike Spano, who said the fire appeared to be contained to one building.

“You look at a building like that, that building’s got to be well over 75 years old,” he told the station. “There are lots of places for fires to hide in buildings like that and when they get started, they are very stubborn, they don’t want to stop.”

A spokeswoman for the American Red Cross, which is helping displaced residents, said a temporary shelter was set up at Roosevelt High School.