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The mother of the two brothers suspected of the Boston Marathon bombing has said she is "sure that (her) kids were not involved" in the blasts.
In a tearful press conference, Zubeidat Tsarnaev said she would have noticed if her sons had been planning such an attack, saying: "Any change, we should feel, I should feel it."
In a tearful press conference the mother of the two brothers suspected of the Boston Marathon bombing has said that: "I don't and I won't" accept that her sons were involved in the attack.
Asked if she wishes her family had never moved to the US Zubeidat Tsarnaev said: "I thought America would protect us. It would be safe. America took my kids away from me."
Earlier this week ITV News Correspondent Martin Geissler spoke to Zubeidat Tsarnaev.
Russia tipped off the FBI about Boston Marathon bombing suspect Tamerlan Tsarnaev twice in 2011, US officials told Reuters.
The second warning raised questions about whether the FBI and CIA failed to share information.
Republican senator and member of the Senate Intelligence Committee Dan Coats said: "That's something that we have to look at.
"That's one of the key things that we have learned and need to work on to make sure it doesn't happen again, and that is simultaneous communication to all the relevant agencies when a warning is posted."
In a briefing to a House of Representatives panel, US investigators said the two suspects apparently became radicalised by information on the internet.
Officials in the United States say the surviving suspect in the Boston bombings has acknowledged his role in the attacks. However it is unclear whether the admission could be used at a criminal trial because it happened before authorities advised Dzhokhar Tsarnaev of his constitutional rights.
It is also unclear whether prosecutors would need the admission by Dzhokhar Tsarnaev to secure a conviction because physical evidence has already been uncovered in the investigation.
US authorities added the name of the Boston bombing suspect Tamerlan Tsarnaev to a terrorist database 18 months before the explosions, but did not follow up their inquiry.
Officials say the CIA made the request to add Tamerlan's name after the Russian government contacted them with concerns he had become a follower of radical Islam.
US investigators have revealed the two bombs that went off at the Boston Marathon were detonated with the kind of remote control device used for a toy car.
US Representative Dutch Ruppersberger, the top Democrat on the House Intelligence Committee said: "It was a remote control for toy cars. Which says to me, and brother number two has said, they got the information on how to build the bomb from Inspire magazine."
Inspire was created by the American-Yemeni preacher Anwar al-Awlaki, a leader of al Qaeda's affiliate in Yemen who was killed in a U.S. drone strike. Ruppersberger said the article on bomb-building in Inspire was headlined: "How to build a bomb in your mom's kitchen."
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A man carjacked by the Boston Marathon bombings suspects has given his account of the moment he was taken hostage and his eventual escape.