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

The FBI found more than 150 homemade bombs during a raid on a Virginia farm when they arrested a man on a firearms charge, federal prosecutors allege. The big picture: Preliminarily assessments of the haul seized from Brad Kenneth Spafford's Isle of Wight County farm indicate it's "the largest seizure by number of finished explosive devices in FBI history,

The FBI is working to determine the plans of a 36-year-old suspect after investigators discovered over 150 explosives, primarily pipe bombs, on his 20-acre farm. According to the FBI, this is the largest cache of explosives ever found in the bureau’s more than 100-year history.