Timeline: Boston Marathon bombings

Published On: Apr 16 2013 11:30:08 AM CDT   Updated On: Jul 10 2013 03:08:11 PM CDT

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.

SWAT officers patrol Copley Square, Boston Marathon bombing
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Neal Hamberg/Reuters

9 a.m., April 16 -- A heavy police presence remains in Boston as the city remains on heightened alert.

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