According to this guy (FadingPain) it was no big deal:
Posted Today, 12:42 AM
Yeah, he had an air pellet pistol and a paintball pistol, apparently.
He did look like your good old fashioned "NUTJOB" and not some terrorist type to be worried about.
Look at the truck he used! Some sort of little Home Depot flatbed/pickup truck which is not nearly big/heavy enough for what he was trying to do.
Guy's not only insane, he's stupid.
The interesting thing is that this type of thing always ends with a dead nut job, but this guy is in custody and doing well.
I don't think they will get much intel out of him though. Some sort of immigrant from Uzbekistan I believe..