It's not as easy as some think to obtain fully automatic weapons in the US. Sure, it can be done, but you can't just walk into your local gun store and say, "Hey, gimme a coupla Uzis, an HK MP5, and a couple of M60s, would ya?" Licensed dealers, even those who might be licensed to sell such things, will look at you askance and, if they think you're serious, call the cops.

However, I do expect attacks of this sort using available weapons. The shooter at VT, the shooter at Trolley Square, the Columbine shooters, were all just as much terrorists as a guy in Bagdad with a truck bomb.

From what I've read of THESE particular guys, well, they weren't very bright.