Read the Article at HuffingtonPost
Possessing semi-automatic pistols is one story, like the perpetrator of the Virginia Tech Massacre Cho Seung-Hui did. At least Cho acquired them through legal means (although whether guns should be legal at all is another story). But having an AK-47 assault rifle is illegal anywhere, which makes this even more worrisome.
The question now becomes whether or not if this is an insane person or a domestic terrorist.