A fire that broke out at a home in Hawaii Kai Monday caused damage estimated at $420,000 to the structure and its contents, the Honolulu Fire Department said.

The fire that originated in a bedroom was caused by an electrical arc at an extension outlet located near combustibles. The fire department classified the cause as accidental.

Nearly 40 firefighters responded to a 911 call of a fire at a residence in the 200 block of Ainahou Street just before 8:25 a.m. Monday. Upon arrival, crews saw smoke and flames emanating from the home, the fire department said.

Firefighters brought the fire under control just after 8:35 a.m. and extinguished it about 20 minutes later.

No injuries were reported.

The American Red Cross was contacted to assist two adults displaced by the fire.