Actually, that particular footage was shown on local news (carrying off the bomb materials). You're right about the source of the Islamic materials information, and folks can give it as much weight as they like. I kind of like seeing all the info out there and letting people decide which parts don't work, and which parts do.
That's my feeling, too. I don't think we want to stir up hysteria - but since nobody I have talked to today has even heard about this incident, I don't think that's likely! - but anything is possible and should be examined.