A Chicago-area raid looks to have captured a planner of the massacre.
The horrible massacre should have come as a surprise to no one.
An exclusive report on the recent arrest of American Tarek Mehanna and the author's online monitoring of his jihadist activities.
But more terrorists involved in disrupted plots may be on the loose and still intent on carrying out an attack.
Do we arrest potential terrorists too early and allow them to plead to lesser charges? Or do we wait and risk an attack?