The Honolulu Fire Department classified Monday’s early morning brush fire that scorched 25 acres in Kunia as arson, ignited by a vehicle fire that was intentionally set.

Radiated heat from flames that destroyed a black Ford E-450 passenger van ignited surrounding brush at about 3:35 a.m. Monday.

Firefighters battled the fire for more than two hours and fully extinguished it at about 6:10 a.m. No structures were threatened and no injuries were reported.

Damage to the passenger van was estimated at $40,000.