A participant number tag is seen among running shoes left at the makeshift memorial following the 2013 Boston Marathon bombings, in an exhibit titled "Dear Boston: Messages from the Marathon Memorial"... more 
A participant number tag is seen among running shoes left at the makeshift memorial following the 2013 Boston Marathon bombings, in an exhibit titled "Dear Boston: Messages from the Marathon Memorial" at the Boston Public Library in Boston, Massachusetts April 16, 2014. The 118th running of the Boston Marathon will be held April 21. REUTERS/Brian Snyder (UNITED STATES - Tags: SPORT ATHLETICS DISASTER CRIME LAW TPX IMAGES OF THE DAY) less 
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Reuters | Photo By BRIAN SNYDER / REUTERS
Wed, Apr 16, 2014 4:32 PM EDT