BANNING, Calif. -

Three men who allegedly maintained an underground bunker loaded with explosives on their property and had a vehicle containing more explosives are tentatively scheduled to appear in court today.

Bruce Borynack, 49, and his sons -- Zackariah Borynack, 25, and Zephaniah Borynack, 23 -- were arrested Sunday, when authorities served a search warrant at their residence in the 10000 block of Nancy Avenue in Cherry Valley. Bruce Borynack and Zackariah had been seen driving away earlier that 

morning, and were detained when authorities stopped their vehicle near Oak Valley Parkway and Oak View Drive in Beaumont, sheriff's Sgt. James Burton said.

``(Due) to the potential of explosives inside the vehicle, the Riverside County Sheriff's Hazardous Device Team responded and secured the vehicle with a robotic device,'' Burton said.

A sheriff's SWAT unit then served the search warrant at the residence, where authorities had to convince a man and a woman to leave during a brief standoff. They were detained and the woman was later released, Burton said.

While searching the property, authorities found an underground bunker containing ``a large amount of explosive munitions,'' Burton said. U.S. Air Force hazardous materials experts and FBI agents were called in to help with the investigation. Burton didn't say what kind of explosives were found in the bunker and vehicle.

The three Borynacks were booked at the Larry D. Smith Correctional Facility in Banning in lieu of $500,000 bail each and are expected to be arraigned at the Banning Court, according to jail records.

Bruce Borynack and Zackariah Borynack were additionally booked for allegedly committing felonies while on bail. 

The two were arrested and charged in August 2011 with 40 counts of being in possession of explosive devices after Zackariah Borynack inadvertently ignited a brush fire while setting off an improvised explosive device, according to court documents.

More hazardous materials were later seized at the men's home. Both defendants eventually posted $25,000 bail and were released from custody. 

They're slated to appear for a trial-setting conference in connection with that case on Oct. 15.