Crews worked to put out a house fire in Warren County, N.J. Thursday morning.

The fire broke out around 9:00 a.m. at 404 Warren Street in Greenwich Township, officials said.

"The left side of the home had flames coming out and when the flames came out of the front window it exposed and went up into the upper level from the outside," said Chief Joe Mecsey with the Stewartsville Volunteer Fire Company.

He said it started in a lower level bedroom.

"Right now it's looking accidental," he said. "We had the majority of the fire knocked down within probably 20 to 30 minutes."

Chief Mecsey said the people inside and two dogs were able to make it out safely, but three cats are unaccounted for.

He said the house has an 80 percent loss.

"It'll probably have to be tore down and reconstructed," he said.

The cause is undetermined at this point and still under investigation, but Chief Mecsey said they have an idea.

"They're thinking maybe a candle got tipped over, at this time, next to the bed," he said.

Neighbor Fred Ruffolo said, "I feel bad for them. If they need help, we're here with anything they need."