Who knows? A guy from homeland just indicated it looked foreign based on the fact that it was targeted at civilians and not the usual domestic targets like government and financial centers. He also said the fact that there was more than one device location sounds international.

If you want to see gruesome pics, go to Liveleak.com
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I really wanted to go to that Bukake because I thought for sure that you were going to be on the receiving end. - Ryan Knox to Jeff Steward