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Timeline: Boston Marathon bombings

POSTED: 12:30 PM EDT Apr 16, 2013    UPDATED: 04:08 PM EDT Jul 10, 2013 

With Boston Marathon bombing suspect Dzhokhar Tsarnaev pleading not guilty Wednesday in his first court appearance since being arrested, revisit a timeline of the events in the case so far.

Marathon Timeline - Race Begins
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9 a.m., April 15 -- Mobility-impaired runners kick off the 117th Boston Marathon.

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