William Celli, 55, is being held at the Contra Costa County Jail on a $525,000 bond after an anonymous caller tipped police off about Celli’s activities. The owner of a plumbing company was charged with possessing an explosive device and making criminal threats.

The FBI announced Wednesday that the San Bernardino shooters did not openly post on social media about jihad, but did have conversations about martyrdom using "private direct messages."

Over the weekend, the terrorist group Boko Haram declared their sudden allegiance to that other terrorist clan ISIS. Boko Haram shared an audio message on their Twitter…