Wasn't there something similar after Jared Loughner went berserk? Some strange publicity-hound sort of guy who claimed to be one of the wounded?
Yep, I can't recall his name, but they even locked the guy up briefly for a psyche evaluation or something like that. The way these events bring the crazies out of the woodwork, it's hard to know how far to trust this fellow.
That said, a lot about this guy's story doesn't add up. It wouldn't be the first time someone used a disaster to get attention for themselves.
Just one point for instance. The staff locked the school down and demanded ID before they would even let the police in. So how did the kids get out? And if they went out the main entrance and down the road the first structure they would find is the fire station - where emergency responders were mustering. How did they end up past the fire station in a private home driveway?