Marathon runners Cindy Hill and Michael Schlitt
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Boston blasts: Everyone said 'Run, you need to run'

16 April 2013 Last updated at 09:41 BST

An investigation is under way after two explosions near the finishing line of the Boston Marathon left three people dead and more than 100 injured.

The FBI has taken over co-ordination of what it described as a "potential terrorist inquiry".

Runners have been describing their experience of the blasts.