FBI investigation of a Virginia man led to what the agency calls its largest-ever seizure by number of finished explosive devices.

Prosecutors are fighting to keep a Virginia man behind bars after they say investigators found what could be the largest number of “finished explosive devices” in FBI history at his 20-acre home near Norfolk.

Several additional apparent pipe bombs were found in a backpack in the home’s bedroom, completely unsecured," prosecutors said in court documents.

Federal agents have discovered over 150 explosive devices and arrested Virginia man Brad Spafford for possessing an unregistered short-barreled rifle. The investigation, initiated by a neighbor's tip,

Investigators say they found the largest collection of explosive devices in FBI history at the Virginia home of Brad Spafford, who has been arrested.

A Virginia man was arrested after federal authorities found a cache of homemade explosive devices, some of which were marked as "lethal," at his home, marking the largest seizure of finished explosive devices in FBI history,

The FBI arrested a Virginia man it says had the largest stockpile of explosives recovered in the agency’s history. Brad Spafford was arrested earlier this month at his farm outside Norfolk

The 19-year-old suspect was arrested and held without bond after several homemade explosive devices were found in a vehicle believed to have been stolen, officials said.

An FBI raid of a Virginia home uncovered more than 150 homemade explosive devices, the largest the agency has encountered in its history.