marathon racers are a special breed. they a ma racers are a eyhare a commitment to months of training and running ridiculously long runs. that s for sure. that s why the bombing at the marathon in boston seed personal for the runners in this week s marathon in london. abc s nick schifrin has more. let us now show our respect and support. reporter: from the beginning london remembered boston. in boston. reporter: 35,000 runners wearing black ribbons standing silent. one of them was jack. all of a sudden now, we hear another siren. reporter: the 67-year-old army vet was running with his daughter half a mile from the boston finish line when the bombs exploded. what i will be thinking about in london is the people that got hurt in boston. i will run for the people back in boston. reporter: that is 25-year-old tatiana mcfadden who has never walked, but won the boston wheelchair marathon. they ran for boston in