Brighton runner Abi Griffiths crossed the finish line of the Boston Marathon around ten minutes before the explosions happened.
She said: "It was as I was retrieving my bag that I heard an explosion, now everyone sort of looked around and there was a moment of disbelief and bewilderment, you didn't exactly know what had happened, but a few seconds after that suddenly it went into a state of chaos.
"The sound of the explosion, the ground shook underneath my feet a bit, I mean, just, I've never heard a bomb before but there was just that sixth sense that something bad had happened."
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Records from Gosport War Memorial Hospital between 1989-2000 show that 456 patients died - and at least another 200 lives were shortened.
Health Secretary Jeremy Hunt apologised on behalf of the government and the NHS for what happened at Gosport War Memorial Hospital.
Records from the Gosport War Memorial Hospital between 1989-2000 show 456 patients died - and at least another 200 lives were shortened.