Apr 18, 2013 9:22 AM by ASSOCIATED PRESS
BOSTON (AP) - The review of a mountain of video footage from the area of the Boston Marathon bombings may have produced a breakthrough.
Authorities are said to be focused on a man seen dropping off a bag, and then walking away from the site of the second of two deadly explosions.
A law enforcement official says authorities have spotted an image of someone who could be a potential suspect in the bombings, but they haven't identified that person.
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