WALLINGFORD, Conn. (AP) — A fire that killed two people and critically injured a third at a multifamily home in Connecticut appears to be “criminal in nature,” local authorities said Thursday.

The blaze was reported at about 6 p.m. Wednesday in Wallingford, about 14 miles (23 kilometers) north of New Haven.

Police and firefighters said they initially found a male victim with severe burns outside the home, and he was flown to a hospital burn center in critical condition. Two other people were found in a second-floor apartment including one who was pronounced dead at the scene and another who was declared dead at a hospital, Wallingford police said.

Preliminary results of an investigation by local and state police and fire marshals and the local state’s attorney’s office found that the fire appeared to be a criminal act, police said. Officials did not elaborate, and no arrests had been announced. That investigation remains ongoing.

Authorities said they were still trying to determine Thursday how many people were in the house at the time.

Wallingford police asked anyone with information about the fire to contact them.