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
Safe to say there is very little to get excited about as far as our weather is concerned! All very autumnal over the next few days!
It's certainly not the brightest of starts to the day, with drizzly rain in places.
It will feel much milder tonight that it did last night, with patchy showers around the coasts.