BOSTON – APRIL 15: Katherine Swierk, left, is reunited with her aunt Terry Days, center, and friend Jocelyn Cacio outside Copley Square in Boston after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. Swierk was a race volunteer and Cascio ran the race, dropping out after 25.6 miles. (Photo by John Blanding/The Boston Globe via Getty Images)
