And who are those guys you see in pictures around the site of the bomb blasts with the black ball caps and large black backpacks?
You are asking about people in ball caps and carrying backpacks at a sports event in a college town. Good luck with that.
Two guys who were "identified" by the Internet detectives were looking to tag onto the runners without actually entering but found themselves at the finish not the start. I'll bet they were not the only ones.
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