UPDATE: Two Daventry runners speak after being caught up in Boston Marathon blasts

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Two runners from Daventry taking part in the Boston Marathon have said they are okay after two explosions near the finish line.

Mark Heycock and Melanie Cotton were running the event.

They have taken to Facebook to reassure family and friends that they are alright.

Paul Campbell Mr Heycock’s boss at Campbells etate agents in Daventry said he believed the couple were about 1km away from the finishing line when the first blast happened.

Mr Heycock told the Daventry Express: “I was just a terrible and disappointing end to what started as a fantastic day.

“We were stopped by the police along with thousands of other runners about 0.4 of a mile from the finish line, at the stage we didn’t really know what was happening, but the news of the incident soon got filtered back.

“Our hearts and thoughts are with all those directly involved in this awful and senseless incident.”

Horrifying images of injured spectators and blood-splattered pavements were caught as television cameras broadcast footage of the explosions.

Participants were also seen lying on the ground as the impact tore through the finish line, sending smoke and debris soaring into the air.

The FBI said it was leading a “potential terrorism investigation” by the city’s joint terrorism taskforce into the twin explosions. But reports of a suspect being held at a city hospital were dismissed by Ed Davis, Boston’s Police Commissioner, who told a press conference that no suspect had been arrested.

In a televised address, US President Barack Obama said those responsible will feel the “full weight of justice”.

Three people died in the blasts and at least 17 people are critically wounded, officials say, and the injuries include several amputations.