FILE -- In this April 15, 2013 file photo, Robson Souto, right, of Brazil, stops to kiss Laura Cabral, a Wellesley College student from Chicago, during the 117th running of the Boston Marathon in Wellesley, Mass. Security will be tightened for the 2014 Boston Marathon after twin explosions killed three people and injured more than 260 near the finish line of the race in 2013. More police officers will be on the course in Wellesley, the halfway point, but they don’t plan to try to stop the favorite marathon tradition: a line of Wellesley College students kissing and hugging runners. (AP Photo/Michael Dwyer, File)