A Virginia man was arrested in December with what federal prosecutors described in court papers Monday as the largest cache of “finished explosive devices” ever found in the FBI’s history.

The man, Brad Spafford, was taken into custody at a farm outside Norfolk on Dec. 17 on the basis of a single-count criminal complaint accusing him of illegally possessing an unregistered short-barrel rifle. When investigators searched his 20-acre property, in Isle of Wight County, they found in a detached garage more than 150 explosive devices — mostly pipe bombs, some of them labeled “lethal,” prosecutors said.

They found more pipe bombs in a bedroom inside Spafford’s house, loosely stuffed in a backpack that bore a logo reading “#NoLivesMatter,” prosecutors said.

No Lives Matter is a nihilistic, far-right ideology that largely exists on encrypted online messaging apps like Telegram. The movement’s adherents promote “targeted attacks, mass killings and criminal activity,” according to a federal threat assessment.

— The New York Times