After police searched the building, he sent another taunting email, then another on Monday, threatening to detonate four different bombs missed by the sweep. He followed that on Tuesday morning with a telephoned threat to "blow up this [expletive] school."
Two other high schools in the north end of the borough also cleared out Tuesday morning after receiving bomb threats, but investigators haven't yet determined if the same suspect was involved in those.
Bomb threats, "SWATting" and other malevolence have been linked to online gamer culture over the past several years, terrorizing livestreamers and online personalities, but only occasionally resulting in arrest.