Article Photos: Boston Marathon reaction: No immediate changes planned in Oklahoma City Memorial Marathon 36/44

People react to a second explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/The Boston Globe,  John Tlumacki) ORG XMIT: MABOD808