A fire in an abandoned house in Queens that left three squatters dead was intentionally set, police said.

The three victims, all men, were inside the building on Farmers Blvd near 110th Road in Jamaica when flames tore through the house, officials said.

The victims were pulled from the burning structure and pronounced dead at the scene.

The FDNY ruled the Nov. 21 blaze is a case of arson — and police are now classifying the deaths as homicide, authorities said.

Investigators do not yet know who started the fire, and there have been no arrests.

The identities of the victims were being withheld until family is notified.