When the two blasts occurred on Boylston Street, the time stamp read 4 hours 9 minutes on the race clock. Those who crossed the finish line at that moment were some of the last to do so in the 2013 Boston Marathon, as the Boston Athletic Association soon shut down the race in the wake of the explosions at 2:50 p.m. Monday.
Runners were diverted off the race course and onto Commonwealth Avenue, as police and ambulances rushed to the scene. Shortly after, no one was allowed to make the turn onto Hereford Street or the turn onto Boylston Street. They instead, continued straight, without any understanding of why they were not following the traditional course.