Federal agents found one of the largest stockpiles of homemade explosives they have ever seized when they arrested a Virginia man on a firearms charge last month, according to a court filing by federal prosecutors.

The FBI has arrested a Virginia man after finding the largest stockpile of "finished explosive devices" in the bureau's history, according to court documents. Brad Spafford was arrested Dec. 17 at his farm in Smithfield.

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.