Investigators seized more than 150 pipe bombs and other homemade devices when they searched the home of Brad Spafford northwest of Norfolk in December, the prosecutors said in a motion filed Monday. The prosecutors wrote that this is believed to be “the largest seizure by number of finished explosive devices in FBI history.

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.