You've begged yet another question: how did they know he'd gotten there? Says to me that we've been coordinating with the Canadians on it.
I'd say that they were tracking him, and picked him up when the time was right.
I'd bet that the nice Sudanese pilot made some visits to friends, and there are more arrests underway.
I'd further bet that the Buffalo Al Qaeda cell had something to do with it, given that they were talking about "something big" happening.
Also given that the Buffalo Boys were up in Canada dropping BIG money--$89k--in a casino. First question is where the goober got the bucks; second question is WHO ultimately handled it in the casino; third question is what did HE do with it? My guess is it's support money for the Sudanese pilot's "mission".