STOP USING SOUND REASON DAMNIT! FRIGGIN KILLJOY!!
Sound reason? Hardly. In what we like to call “reality” around here, it is well known that a terrorist is not always connected in a tangible way to known groups or organizations. A terrorist can commit an act of terrorism on his own, and the people are just as dead as if he’d had a direct line to Osama himself.
Thus, it makes no difference if there was a “known” connection. They were going to blow people up, with or without connections. That’s terrorism.
Perhaps it depends on what your definition of terrorism is. For me, muslims plus illegal explosives equals links to terrorism. Perhaps for you, they need to ignite the bomb first.