An unattended electric heater caused the fire that killed two women and displaced dozens inside an East New York building Wednesday, officials say.

The fire started inside of a deli at 964 Belmont Ave. at 1:30 a.m.

Fire officials say the flames from the heater quickly spread from the deli and up to the apartments above where there were no working smoke alarms. 

The women were found on the third floor of the building, and were both transported to the Brookdale Hospital where they were pronounced dead, officials say.

The identities of the victims have not been released.

At least 60 people have been displaced including 40 adults and 20 children.

The American Red Cross is working to assist the families with temporary housing.