Followers of ISIS had been sending messages about the event in Texas for more than a week, calling for attacks. One referenced January's Charlie Hebdo massacre in France and said it was time for "brothers" in the United States to do their part.
Simpson was well known to the FBI. Five years ago he was convicted for lying to federal agents about his plans to travel to Africa, but a judge ruled the government did not adequately prove he was going to join a terror group there.
As for the second suspect, the FBI is combing through files on all of Simpson's known associates in Phoenix and elsewhere, but so far there has been no word on the accomplice's identity.
They want to do it here; they just picked a bad place to do it. Some of them will try again.