Underground bunkers, caches of explosives found while firefighters fend off wildfire

BRIAN HEAD, Utah (KSTU) -- Authorities found numerous cabins and underground bunkers filled with explosives near Brian Head while fighting wildfires in Iron County earlier this year, the Iron County Sheriff's Office said.

Bomb experts have since cleared the weapons and explosives from the underground caches and now a Utah man may face charges.

Back in June, firefighters in the Henderson Hill area heard popping noises and discovered it was from ammunition exploding in the flames.

Firefighters traced the ammunition to a burned down cabin and found an underground bunker nearby filled with dozens of hand grenades that had been altered by drilling out the bottoms and plugging the drilled holes with threaded, galvanized pipe plugs.

RELATED: Aerial images of California's wildfire devastation

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Aerial images of California's wildfire devastation
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Aerial images of California's wildfire devastation
An aerial shows damage caused by wildfires in Santa Rosa, California, U.S October 11, 2017. Picture taken October 11, 2017. REUTERS/DroneBase
TOPSHOT - An aerial view shows a burned property in Santa Rosa, California on October 12, 2017. Hundreds of people are still missing in massive wildfires which have swept through California killing at least 26 people and damaging thousands of homes, businesses and other buildings. / AFP PHOTO / JOSH EDELSON (Photo credit should read JOSH EDELSON/AFP/Getty Images)
Residences and vineyards burned by wildfires are seen in this aerial photograph taken above Santa Rosa, California, U.S., on Thursday, Oct. 12, 2017. Wildfires that tore through northern California's iconic wine-growing regions have prompted evacuations of more than 20,000 people, killed 11 and damaged some of the most valuable vineyards and wineries in the U.S. About 1,500 commercial, residential and industrial structures were burned, and damage assessment teams have started accounting for the destruction. Photographer: David Paul Morris/Bloomberg via Getty Images
An aerial view shows a burned school in Santa Rosa, California on October 12, 2017. Hundreds of people are still missing in massive wildfires which have swept through California killing at least 26 people and damaging thousands of homes, businesses and other buildings. / AFP PHOTO / JOSH EDELSON (Photo credit should read JOSH EDELSON/AFP/Getty Images)
An aerial shows damage caused by wildfires in Santa Rosa, California, U.S October 11, 2017. Picture taken October 11, 2017. REUTERS/DroneBase TPX IMAGES OF THE DAY
TOPSHOT - Fire damage is seen from the air in the Coffey Park neighborhood on October 11, 2017, in Santa Rosa, California More than 200 fire engines and firefighting crews from around the country were being rushed to California on Wednesday to help battle infernos which have left at least 21 people dead and thousands homeless. / AFP PHOTO / Elijah Nouvelage (Photo credit should read ELIJAH NOUVELAGE/AFP/Getty Images)
An aerial view shows firefighters working at a burned property in Santa Rosa, California on October 12, 2017. Hundreds of people are still missing in massive wildfires which have swept through California killing at least 26 people and damaging thousands of homes, businesses and other buildings. / AFP PHOTO / JOSH EDELSON (Photo credit should read JOSH EDELSON/AFP/Getty Images)
An aerial shows damage caused by wildfires in Santa Rosa, California, U.S October 11, 2017. Picture taken October 11, 2017. REUTERS/DroneBase
SANTA ROSA, CA - OCTOBER 11: An aerial view of homes that were destroyed by the Tubbs Fire on October 11, 2017 in Santa Rosa, California. At least 21 people have died in wildfires that have burned tens of thousands of acres and destroyed over 3,000 homes and businesses in several Northen California counties. (Photo by Justin Sullivan/Getty Images)
Pacific Gas and Electric Co. crew repairing a downed power line damaged by wildfires are seen in this aerial photograph taken above Santa Rosa, California, U.S., on Thursday, Oct. 12, 2017. Wildfires that tore through northern California's iconic wine-growing regions have prompted evacuations of more than 20,000 people, killed 11 and damaged some of the most valuable vineyards and wineries in the U.S. About 1,500 commercial, residential and industrial structures were burned, and damage assessment teams have started accounting for the destruction. Photographer: David Paul Morris/Bloomberg via Getty Images
An aerial shows damage caused by wildfires in Santa Rosa, California, U.S October 11, 2017. Picture taken October 11, 2017. REUTERS/DroneBase
Residences burned by wildfires are seen in this aerial photograph taken above Santa Rosa, California, U.S., on Thursday, Oct. 12, 2017. Wildfires that tore through northern California's iconic wine-growing regions have prompted evacuations of more than 20,000 people, killed 11 and damaged some of the most valuable vineyards and wineries in the U.S. About 1,500 commercial, residential and industrial structures were burned, and damage assessment teams have started accounting for the destruction. Photographer: Chip Chipman/Bloomberg via Getty Images
An aerial shows damage caused by wildfires in Santa Rosa, California, U.S October 11, 2017. Picture taken October 11, 2017. REUTERS/DroneBase
TOPSHOT - Fire damage is seen from the air in the Coffey Park neighborhood October 11, 2017, in Santa Rosa, California. More than 200 fire engines and firefighting crews from around the country were being rushed to California on Wednesday to help battle infernos which have left at least 21 people dead and thousands homeless. / AFP PHOTO / Elijah Nouvelage (Photo credit should read ELIJAH NOUVELAGE/AFP/Getty Images)
An aerial shows damage caused by wildfires in Santa Rosa, California, U.S October 11, 2017. Picture taken October 11, 2017. REUTERS/DroneBase
Fire damage is seen from the air in the Coffey Park neighborhood October 11, 2017, in Santa Rosa, California More than 200 fire engines and firefighting crews from around the country were being rushed to California on Wednesday to help battle infernos which have left at least 21 people dead and thousands homeless. / AFP PHOTO / Elijah Nouvelage (Photo credit should read ELIJAH NOUVELAGE/AFP/Getty Images)
An aerial shows damage caused by wildfires in Santa Rosa, California, U.S October 11, 2017. Picture taken October 11, 2017. REUTERS/DroneBase
Traffic travelling along a highway near a Kmart discount store burned by wildfires is seen in this aerial photograph taken above Santa Rosa, California, U.S., on Thursday, Oct. 12, 2017. Wildfires that tore through northern California's iconic wine-growing regions have prompted evacuations of more than 20,000 people, killed 11 and damaged some of the most valuable vineyards and wineries in the U.S. About 1,500 commercial, residential and industrial structures were burned, and damage assessment teams have started accounting for the destruction. Photographer: David Paul Morris/Bloomberg via Getty Images
An aerial shows damage caused by wildfires in Santa Rosa, California, U.S October 11, 2017. Picture taken October 11, 2017. REUTERS/DroneBase
In this aerial view, burned properties are seen in Santa Rosa, California on October 12, 2017. Hundreds of people are still missing in massive wildfires which have swept through California killing at least 26 people and damaging thousands of homes, businesses and other buildings. / AFP PHOTO / JOSH EDELSON (Photo credit should read JOSH EDELSON/AFP/Getty Images)
Fire damage is seen from the air in the Coffey Park neighborhood on October 11, 2017, in Santa Rosa, California More than 200 fire engines and firefighting crews from around the country were being rushed to California on Wednesday to help battle infernos which have left at least 21 people dead and thousands homeless. / AFP PHOTO / Elijah Nouvelage (Photo credit should read ELIJAH NOUVELAGE/AFP/Getty Images)
An aerial shows damage caused by wildfires in Santa Rosa, California, U.S October 11, 2017. Picture taken October 11, 2017. REUTERS/DroneBase
Residences burned by wildfires are seen in this aerial photograph taken above Santa Rosa, California, U.S., on Thursday, Oct. 12, 2017. Wildfires that tore through northern California's iconic wine-growing regions have prompted evacuations of more than 20,000 people, killed 11 and damaged some of the most valuable vineyards and wineries in the U.S. About 1,500 commercial, residential and industrial structures were burned, and damage assessment teams have started accounting for the destruction. Photographer: David Paul Morris/Bloomberg via Getty Images
In this aerial view, burned properties are seen in Santa Rosa, California on October 12, 2017. Hundreds of people are still missing in massive wildfires which have swept through California killing at least 26 people and damaging thousands of homes, businesses and other buildings. / AFP PHOTO / JOSH EDELSON (Photo credit should read JOSH EDELSON/AFP/Getty Images)
TOPSHOT - An aerial view shows burned properties in Santa Rosa, California on October 12, 2017. Hundreds of people are still missing in massive wildfires which have swept through California killing at least 26 people and damaging thousands of homes, businesses and other buildings. / AFP PHOTO / JOSH EDELSON (Photo credit should read JOSH EDELSON/AFP/Getty Images)
Residences burned by wildfires are seen in this aerial photograph taken above Santa Rosa, California, U.S., on Thursday, Oct. 12, 2017. Wildfires that tore through northern California's iconic wine-growing regions have prompted evacuations of more than 20,000 people, killed 11 and damaged some of the most valuable vineyards and wineries in the U.S. About 1,500 commercial, residential and industrial structures were burned, and damage assessment teams have started accounting for the destruction. Photographer: David Paul Morris/Bloomberg via Getty Images
TOPSHOT - Fire damage is seen from the air in the Coffey Park neighborhood October 11, 2017, in Santa Rosa, California More than 200 fire engines and firefighting crews from around the country were being rushed to California on Wednesday to help battle infernos which have left at least 21 people dead and thousands homeless. / AFP PHOTO / Elijah Nouvelage (Photo credit should read ELIJAH NOUVELAGE/AFP/Getty Images)
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They also found explosive powder, fuses and ammunition inside.

Officers found the person of interest at him home in Parowan on June 30.

They said he was cooperative and eventually admitted the burned down cabin and bunker were his.

He also told them he had seven or eight more cabins and bunkers hidden throughout the area which also contained firearms, ammunition and food storage.

Bomb technicians destroyed the explosives and a "significant quantity of black powder."

Investigators determined these cabins and bunkers were on public land managed by the US Forest Service and on land owned and managed by the Utah State Institutional Trust Land.

Authorities are still investigating these remote illegal cabins, bunkers and storage caches.

Iron County Lt. Del Schlosser said the sheriff's office will present the case to Utah US Attorney John Huber and the Iron County Attorney when the investigation is complete.

The name of the person of interest has not been released at this time.

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