Residents in Haiku, Maui, said they heard an explosion before flames were seen coming from a house on Aoku Place, the Maui Fire Department said.

Fire Services Chief Edward Taomoto said the fire destroyed much of an extension to a single-story house, but the original portion of the house received only minor smoke damage.

Damage was estimated at $130,000 to the structure, its contents and two vehicles parked outside.

Firefighters arrived at 6:44 a.m. after the 6:31 a.m. alarm, and found the extension fully engulfed in flames. A battalion chief and 13 firefighters extinguished the fire at 7:47 a.m.

No one was home when firefighters arrived, but the fire crew found a mixed breed pitbull hiding in a corner of the unburned part of the structure, Taomoto said. The dog was brought out unharmed.