Nearly 36,000 runners set out from the Boston Marathon starting line with security tight along the 26.2-mile course in a show of resilience a year after the bombing that turned the race into a scene of carnage.

Nearly 36,000 runners set out from the Boston Marathon starting line with security tight along the 26.2-mile course today, in a show of resilience a year after the bombing that turned the race into a scene of carnage.