Graphic: Finishing times for previous Boston Marathons

The graphic displays the average finishing times for previous participants in the Boston Marathon. The explosions that caused mass casualties at the finish line occurred roughly six hours after the race began and is marked in above yellow.

( Reuters )

The graphic displays the average finishing times for previous participants in the Boston Marathon. The explosions that caused mass casualties at the finish line occurred roughly six hours after the race began and is marked in above yellow.

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