(CNN) -- The Boston Marathon, which had been run since 1897, was rocked Monday by two explosions at the finish line. Here are a few facts, by the numbers, about the 2013 race, according to the Boston Athletic Association: . -- In all, 26,839 runners and wheelchair racers registered. Of them, 15,233 are men, and 11,606 are women. -- There are participants from 56 U.S. states and territories. -- Seventy-four countries of residence and 96 countries of citizenship are represented.
Boston Marathon has been run since 1897 . In all, 26,839 runners and wheelchair racers registered . There are participants from 56 U.S. states and territories .