The Honolulu Fire Department battled a wildland fire in Kawainui Marsh for four and a half hours today before containing it.

Police shut down Kapaa Quarry Road, while firefighters attacked the flames and tried to further prevent the fire spread. Police said the road was reopened at about 8 p.m.

Seven units, including Air1, staffed with 20 personnel, responded at 1:20 p.m.

The first unit got to the scene at 1:27 p.m.

Firefighters dealt with the unstable footing of the marsh and reeds and 6-foot tall California grass, HFD said in a news release.

State Airport Rescue Fire Fighters sent three units to assist.

A total of four acres burned. No structures were threatened and no injuries were reported.

The fire remains under investigation, and a cause has not yet been determined, HFD said this evening.

Police said the road was closed between Mokapu Boulevard and Kapaa Quarry Place at about 1:50 p.m. and remained closed at 7:24 p.m.