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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It feels much fresher out there than it has done recently. So hopefully a much more comfortable night's sleep all round.
Shadow Welsh Secretary criticises timing clash for denying Welsh MPs the chance to debate controversial English veto