Welsh runner describes 'shock and sadness'

Stuart Trimby from Cardiff told us how he was on the last mile of the Boston Marathon when he heard two explosions.

Pictured here with his friend Emma Clatworthy Davies before the race, he said he feels "shock and sadness" at the way a positive occasion was ruined by the explosions.

You may find some of the images in the video upsetting.

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Boston Marathon explosions

Three people have died and more than 100 people are wounded after two explosions at the Boston Marathon. There are sites to help find the 374 British and 108 Irish runners that were expected to have taken part in the Boston Marathon.