killed. i m jim vance. the military vehicle involved was at the front of a motorcade for one of the heads of state visiting washington. now the sigh klist death is overshadowing what had been a successful day for the crews overseeing the summit. reporter: jim, officials have been preparing for this massive two-day summit for months. day one was going according to plan, traffic moving, people listening to warnings, but then around 6:00 as officials were leaving the convention center a cyclist was struck and killed on 12th and new york, now marring this nuclear security summit in tragedy. nearby office workers looked on in horror after a cyclist was struck and killed in front of a delegate s motorcade. it was this five-ton truck that was involved in the collision. it was pulling forward to block as the procession was coming through. there was a collision between our truck and a cyclist, a fatal collision. reporter: organizers say it happened around 6:05 this evening. howe