All of the articles first did suspect Muslim terrorists, but yeah. The guy admitted it, and he was caught at the camp, with the gun. He was also seen at the building that was bombed earlier that day.
I can totally see Irock's point, though. The dude is a total scumbag, and I hope he rots for it, but every little piece of classic terrorist evidence was found on him. 1984, a manifesto, even living on a farm where he had access to large amounts of fertilizer.
Anyway, this is more just about keeping the victims' families in my heart. I can't even imagine.