hours to come. and on sunday family members gathered at a church in the dorchester neighborhood to mourn the third victim, 8-year-old martin richard. on saturday, police remembered another victim of last week, officer sean collier who was shot by the tsarnaev brothers on thursday. london used its own marathon to pay tribute to the victims of the boston bombings. 30 seconds of silence was held at the start of the race. the events in boston in the hearts and minds of the spectators and athletes. many of the 35,000 competitors also wore black ribbons. organizers donated about $3 per runner who crossed the finish line. and a remarkable young woman who moved from the former soviet union to the united states in search of a better life it has been quite a week for wheelchair racer tatiana mcfadden.