Hawaii island firefighters were working to determine what started a fire that caused $200,000 in damage Sunday to a two-story, 3,000-square-foot concrete-and-wood home in Hilo.

The fire already engulfed the second story of the structure at 180 Mauna Loa St. by the time crews arrived at about 10:45 a.m., firefighters said.

Firefighters used water and foam to extinguish the fire.

The fire may have started in a bedroom on the northern side of the building, where damage was heaviest, firefighters said.

No injuries were reported.