Officials are investigating the cause of a fire that left several firefighters and three others injured in Boerum Hill Monday.

A vacate order is now on the front door of the UFC gym after a raging fire broke out on the roof Monday morning. There’s no word on when the gym will be able to reopen.

At least 200 firefighters responded to the massive three-alarm fire call that escalated to a five-alarm fire.

Authorities say nine firefighters and three civilians were taken to the hospital to be treated for minor injuries.

The fire was contained to the roof of the building, but officials had to break into the apartments below to stop the fire.

Fifteen people are now without a home, but they have been relocated and are being helped by the Red Cross.