Interesting about the AWOL Frenchman possibly being the sniper. I just read an article stating he left around August for the US and Canada and didn't return in September when he was supposed to.
If he is the shooter, he seems to know the area awfully well for someone who just got here about a month before the shootings began. I don't see how he could be doing this solo. It seems he'd have to be working with one or more partners. I hope they're checking this guy's background and who he's been in contact with very thoroughly.
French. Hmmm... That would explain the shooter's arrogance.