Fire investigators are looking into three brush fires that they believe may have been intentionally set Monday morning within 90 minutes in Kalaeloa.

Capt. Terry Seelig, Honolulu Fire Department spokesman, said today’s incidents are the latest in a string of 20 suspicious fires at Kalaeloa since the beginning of the month.

The largest fire covered about a half acre and was reported at 10:05 a.m. at Tripoli and White Plains Beach road. Two fire companies, two tankers and a federal firefighting company responded. It took fire crews nearly two hours to extinguish the blaze.

Firefighters were first summoned at 8:52 a.m. to Saratoga and Franklin avenues to extinguish a smaller blaze. It took one company of firefighters half hour to put out that fire.

At 9:36 a.m. another small fire was reported at Hornet and Saratoga avenues, where firefighters extinguished it in 50 minutes.

Seelig said over the past two to three months these small brush fires at Kalaeloa have become frequent, appearing clusters like they did Monday morning.

All of the fires were set in areas where the brush was overgrown and vacant. No property was in danger.

"They all appear to be intentionally set," Seelig said.

Seelig said anyone with information is encourage to call police or Crimestoppers.