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After the explosion: Moment-by-moment

Published 11:26 AM ET, Wed April 17, 2013
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Witness Ben Thorndike saw Monday's blast at the Boston Marathon from a nearby office building. His sequence of photos, seven shown here, show the moments immediately after the blast. courtesy Ben Thorndike
courtesy Ben Thorndike
courtesy Ben Thorndike
courtesy Ben Thorndike
courtesy Ben Thorndike
courtesy Ben Thorndike
The image ends the sequence of photos showing the moments immediately after the blast. courtesy Ben Thorndike