Comment: There are other pictures of this guy with the towels in higher

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In reply to comment: The guy throwing the dust out... (see in situ)

There are other pictures of this guy with the towels in higher

resolution

No light colored pants and he has towels in his hands not a bag of dust

Also there are close up pictures of that area and there is no dust on the people there.

http://cryptome.org/2013-info/04/boston-bombs/boston-bombs.htm