Near Plano, TexasH asim, the ISIS representative, was pacing and shouting into a cell phone at his ear when Wafic Aziz arrived at the warehouse to begin filling the 55-gallon drums that would constitute the explosive heart of his bomb. Wafic noted with some surprise that the conversation was in Arabic. He set Ibrahim to moving the containers to a little sluice they’d built to make filling them with the ANFO slurry easier and safer. Then he prepared tea on a little hot-plate and tried to make some sense of the one-sided phone conversation. Hasim was angry and arguing with someone. He would listen for a while, pacing like a caged beast, and then start shouting that he was the command representative and his orders would be obeyed. At one point, Wafic heard him say that a schedule must be ad

