GS, a few years ago in Massachusetts some guy was arrested and they used the word arsenal very heavily on account he has something like 3 guns and 500 rounds of ammo. I was just watching CNN where they described an AR15 as something you see the police and military with. No mention that millions of ordinary people have them too.
At this point there is something like a 100% chance that this was Islamic terrorism and the media is begrudgingly offering that it is possible terrorism or that it can’t be ruled out. The word Islamic is being left out of the dialog though.