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.
More top news
A mother from Cardiff has held a fundraising event to help keep the memory of her stillborn son alive.
We featured the story of Ted Owens' heroism in 2012 when he returned to the spot where he was wounded during the Normandy landings.
Sunny spells during the evening with isolated showers easing away, although it will cool off quite quickly.