Boston blasts: Is this what the bomber looked like?
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Second bomb: The photo shows a bag next to a mailbox along the marathon route.
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Is this the man? While everyone seems to instinctively cower - the man dressed in black and highlighted - appears to run away at speed from the scene in the opposite direction to everyone else who was caught up in the blast.
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No arrest has been made but the FBI believe they can see the suspect drop the bag and run away from video footage.
(Photo: NBC via Emily Thorndike)
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Shocking: Seconds after the bombs went off on Boylston Street, there is no sign of the bag. The picture is blurred because of the graphic nature of the content.