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No further Boston threat, says FBI No further Boston threat, says FBI
(35 minutes later)
The FBI has said there are "no known additional threats" in Boston following the bombing of the marathon.The FBI has said there are "no known additional threats" in Boston following the bombing of the marathon.
At a news briefing in the city, officials said no bombs other than the two which exploded at the finishing line had been found.At a news briefing in the city, officials said no bombs other than the two which exploded at the finishing line had been found.
Officials paid tribute to emergency workers and repeated their call for information from the public.
Three people were killed, including an eight-year-old boy, and more than 150 injured by the bombs.Three people were killed, including an eight-year-old boy, and more than 150 injured by the bombs.
Seventeen people are in a critical condition. Doctors treating the wounded have said a number of people have had pellets and "nail-like" fragments removed.
Richard DesLauriers, the FBI agent in charge of the investigation, told reporters there was "no known imminent physical threat at any location where we might be conducting investigative activity right now".Richard DesLauriers, the FBI agent in charge of the investigation, told reporters there was "no known imminent physical threat at any location where we might be conducting investigative activity right now".
He said police had received "voluminous tips" from the public, and urged people to co-operate with investigators.
"We will go to the ends of the Earth to identify the subject or subjects who are responsible for this despicable crime, and we will do everything we can to bring them to justice," he said.
The governor of Massachusetts, Deval Patrick, said it was "important to clarify that two, and only two, explosive devices were found yesterday".The governor of Massachusetts, Deval Patrick, said it was "important to clarify that two, and only two, explosive devices were found yesterday".
There were earlier reports that several unexploded devices had been found across the city.There were earlier reports that several unexploded devices had been found across the city.
Mr Patrick said all other suspect parcels had been examined and found not to be bombs.Mr Patrick said all other suspect parcels had been examined and found not to be bombs.
Officials praised emergency workers and volunteers who had helped those injured, saying they had saved lives.Officials praised emergency workers and volunteers who had helped those injured, saying they had saved lives.
Speaking to reporters at a hospital where many of the wounded have been taken, one doctor said he believed the fragments had been inside the bomb.
He said some patients had more than 40 shrapnel wounds, and that several amputations had been carried out.