Maui police have opened an arson investigation after the cause of a house fire was determined to be a hand-held propane torch left under a house last week in Hana.

The fire happened about 7:50 a.m. Wednesday on Haneoo Road while the owner was off-island, police said.

Firefighters and police responded to the fire, but neighbors already extinguished it.

Investigators found an unknown person used a small hand-held propane torch to ignite the fire under the floor, at the front of the home, police said.

The torch was found propped up underneath the home and pointed toward the floor and support beam, police said. A second-degree arson case has been opened, and no suspects have been identified.

Damage was estimated at $2,500.

Police said it was the second suspicious fire at the home, the first being reported on May 19. Both fires are under investigation.