Boston Bombing Suspects' Mother: My Sons Are Innocent

Zubeidat Tsarnaeva denies Tamerlan and Dzhokhar Tsarnaev were involved with the bombings.
3:00 | 04/25/13

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Transcript for Boston Bombing Suspects' Mother: My Sons Are Innocent
A fine tooth comb and that's what authorities are using to examine every microscopic -- -- of the suspected Boston bombers lives. And the people that most curious to hear from family members who tonight are speaking out. For the first time Nightline hears from the elusive sister who along with her parents believe authorities have persecuted the wrong men. -- words woven into a complex tapestry of mistrust and anger provide a window into the upbringing of these alleged terrorists. Here's ABC's be on a -- -- -- All he needs that added to press conference today is -- they -- Sunday -- a mother -- camera line and -- are. Forcefully denied her sons had anything to do with the Boston Marathon bombing that killed three and injured 264. People I. It's where. With her husband ends or the father of the -- alongside her she went on to blame America for her sorrows. -- -- -- -- -- -- -- -- -- But like any reason but it -- And only a man. She also dismissed reports that her younger son Joseph Carr had already spoken about how the Brothers planned the attack question the veracity of news reports. Not visibly angered she demanded more evidence of their son's guilt. As well as proof that their elder sons -- -- was not killed by police after being captured alive. And why it. You know -- The couple cited videos they had seen on the Internet that claim to show to -- -- being detained by police. Followed by a gruesome photo of a naked dead body. He. My. I want -- don't know what did you read them. -- -- Back in New Jersey the suspects a lucid sister bella broke her silence. Reaching out to -- be -- sending YouTube video suggesting that her Brothers were set up she also sent me this picture along with the text that read not my brother. Now investigators are poring over the details of the -- -- family's life for clues into how and why the Brothers who lived in America for over a decade. Could just turn nominations so violently that the family are ethnic Chechens who -- together to the United States in 2002. Though the parents return to -- some last year while their sons and two daughters remained in the US. While mrs. A picture is emerging of a woman increasingly disillusioned with her adopted homeland. Alyssa Lindley a student who sometimes got facials from -- I had describes in the blog -- that while she was finally and a dedicated mother. She became increasingly devout. Writing she 9/11 was purposefully created by the American government to make America hate Muslims and that she soon started wearing at -- job. She had never -- a hit job while working at the spot and I was really surprised fluently wrote. Then last June's. 16100 dollars worth of clothes from Lord & Taylor and attic Massachusetts. Her arrest warrant is still outstanding it was around this time the family members say Tom -- also started taking -- deeper interest in Islam. Investigators are now focusing on a trip Tom -- -- made back to -- without last year. Concerned that he may have become radicalized in this war -- But at the press conference today -- -- insisted the trip was simply to visit family and attend a relative's wedding. I don't go to Yahoo! News new budget moved on source said it wasn't possible for Tom rely until May contact with extremists or militants during his six month visit. Saying his son never left to sign -- Palin watches in those is they don't want it I was the first reporter to speak with on doors are -- at last Friday he learned just moments before our conversation that -- -- had been killed. He insisted his sons were not involved in the attack and kept asking for. I spoke with him again this morning when he told me he planned to travel to the US as early as tomorrow. Presumably without his wife who is facing down arrest warrant -- investigators will likely want to speak with him experts say he may not have to. It is enough to talk to sell if he wants to talk to the FBI he will or could. Or any other law enforcement official but he can -- and say no to every one. Claim his son's body and go back to Russia. Meanwhile the FBI isn't done it's not working with Russian authorities are looking for any clues from mrs. -- AM that could shed light on what happened to a family. The FBI's probably trying to get as much intelligence as the king and before they go to the Russians. To talk about interviewing the parents. So. If there is no indication. That the parents have any involvement in the case but may have knowledge or history about. So -- ones -- radicalization for example. Those things can basically wait asked if she would ever accept her son's alleged role in the bombings misses are -- answer was clear. No I don't and I won't. Never. For Nightline I'm -- on ankle -- get in New York.

This transcript has been automatically generated and may not be 100% accurate.

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