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.

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,