My source says there are over 61,000 registered permit holders in MN as of 4/30/09.

It's possible, rather than a fully automatic weapon, that they were using a .22 AR (.22 caliber rifle made to look like an automatic weapon or assault rifle) that was fitted with a trigger crank.

Picture an old gatling gun with a crank.  You can mount the crank on the trigger of a .22 AR to allow really quick sucessive trigger pulls.

Still though, doesn't make it any more comforting even assuming it was just a tricked out AR.

I'm going in up there in just a couple days.  Sounds like I may need more kevlar than just the canoe.