Ross Murray has been tweeting of "very relieved families" in Boston, where two explosions went off near the finish line of the Boston Marathon.
Murray, from Newcastle, ran the Boston Athletics Association Elite 1 mile race on Saturday - his first race since competing in the London 2012 Olympics.
Just so everyone knows, I'm ok and well , wasn't around the bombs. Xx
In the hotel, most seem ok but a few seem shaken up, witnessed a few very relieved families meeting up and realised they're all ok #Boston