united states. keep in mind there's a bit of competition going on here. aqap losing some supporters to isis like isis, directing attacks against the u.s. including against the u.s. homeland. one thing i will tell you, erin that even though u.s. counter terror officials say a lone wolf attack inspired by isis may be the most likely attack in the u.s. they still say the most capable terror group in terms of more spectacular attacks is aqap. >> they have the training. they have the history. something obviously very important to watch tonight. new details, i know breaking on where the terror plots were based. frankly, just how close they came to actually executing these attacks over the weekend. >> reporter: that's right. we know that there were a number of arrests, more than ten. isis-related arrests in the last four weeks. some of the arrests tied to plots timed to the july 4th holiday weekend. you can say that dierzays or weeks before they were meant to take