The Associated Press analyzed images and data, including the finishing times recorded by chips on competitors' bibs, over the past several days to pinpoint some of the runners who were in the finish line area when the bombs went off.

NPR: The Finish Line: What The Bombing Was Like

Federal investigators cleared the area near the finish line early Tuesday and began work to inventory evidence, the federal law enforcement source told Townsend.

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In another milestone in Boston's recovery, the area around the marathon finish line was reopened to the public, with fresh cement still drying on the repaired sidewalk.

NPR: Boston Bomb Investigation Extends To Russia