You can see where the folks at Fox are going to have a field day with this one.
"The enemy within."
And a thousand variations of that trope.
Who would want to harm America?
Who has America harmed in the last generation or two? Mind you, the folks "over there," the "other," the "Towelheads," our victims... all those folks have been known to hang on to a grudge for much longer than a generation or two.
So whether this is another case of America's chickens coming home to roost, or just generic blow-back for a poisonous American foreign policy that has terrorized much of the world for the last fifty-plus years, only liars and stupid people can claim they didn't see it coming.
What will America's reaction be?