The unexploded bomb left crucial evidence intact that detectives used to trace Mr Shahzad.
Investigators on Friday recovered an unexploded bomb and other explosives material from what they said was the "control centre" for the attacks - room 1808 in the Marriott.
The retired Bishop of Derry, Dr Edward Daly, told the Saville Inquiry in a telephone call that he and the Stormont MP, Ivan Cooper, went to the security forces in connection with an unexploded IRA bomb.
Electricians were shocked to find an unexploded World War II bomb at a former home of a war veteran.
One unexploded device was found at a hotel on Boylston Street near the bomb site and another unexploded device was found at an undisclosed location, Keating, a Democrat and member of the House Homeland Security Committee, said.
One unexploded device was found at a hotel on Boylston Street near the bomb site, and another unexploded device was found at an undisclosed location, according to Keating, a Democrat and member of the House Homeland Security committee.
CNN: FBI to take lead in investigating Boston Marathon bombings
If the bombers this time were members of the same group of Islamist suicide-bombers who carried out the previous attacks, the analysis of the unexploded material and any other bomb components recovered from the scenes of the blasts might help police discover more about who organised and supplied both sets of attackers.
ECONOMIST: Hunting the London bombers, shooting an innocent man | The
These banners once advertised a trade fair, but now lay wrapped around an unexploded, yard-long Israeli bomb.
Berlin (CNN) -- It happens more often than you might think: Streets cordoned off and bomb disposal experts called in to deal with unexploded bombs that were dropped on Germany nearly 70 years ago.
Any unexploded devices could provide a treasure trove of information such as fingerprints and indications of the bomb maker's design, said the former federal law enforcement official.
The unexploded devices that were recovered could provide a treasure trove of information such as fingerprints and indications of the bomb maker's design, a federal law enforcement official who now works in the intelligence community said.
CNN: FBI to take lead in investigating Boston Marathon bombings
The unexploded devices that were recovered could provide a treasure trove of information such as fingerprints and indications of the bomb maker's design, and from the bombs that did explode, investigators would be looking for fragments and anything indicating the "signature" of the bomb makers, the official told CNN.
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