Boston Marathon canceled for first time since 1918

The race has only been fully canceled or postponed once before -- in 1918, when a military relay race was held during World War I. Tom Grilk, C.E.O.

Of the Boston Athletic Association, explains.

IS THE FIRST TIME THEBOSTON MARATHON WILL NOT BE RUN?APART FROM 1918, THIS IS THEFIRST TIME.THERE HAVE BEEN EVENTS THAT WEREMODIFIED.IN 2012, IT WAS A VERY HOT DAY,SO WE GIVE PEOPLE THEOPPORTUNITY NOT TO RUN IF THEYWANTED NOT TO RUN AND THEY COULDRUN THE FOLLOWING YEAR, IN THEYEAR FOLLOWING THE BOMBING, NOTEVERYONE WAS ABLE TO FINISH THATYEAR AND WE GIVE PEOPLE THEOPPORTUNITY TO COME BACK ANDRUN.THERE WAS A TIME WHEN A VOLCANOCORRUPTION PREVENTED PEOPLE FROMGETTING TO BOSTON, ANDACCOMMODATIONS WERE MADE FORTHEM.THERE IS A PRETTY RICH HISTORYOF ACCOMMODA