Did Boston bombers have help? Investigators checking female DNA evidence.
Investigators have found female DNA on a piece of one of the pressure cookers used as bombs in the Boston Marathon attacks, but it鈥檚 unclear whether the new evidence points to a third suspect, officials briefed on the probe told .
The DNA does not conclusively indicate that the bombing suspects 鈥� brothers Tamerlan and Dzhokhar Tsarnaev 鈥� had an accomplice who helped to either build the bombs or dispose of the evidence. Officials said that the DNA could have come from a store clerk who handled the materials, or from a spectator at the bombing site.
But investigators are using the DNA evidence, as well as a fingerprint found on a bomb fragment, to identify several potential associates, including Katherine Russell, the widow of deceased suspect Tamerlan Tsarnaev, two senior law enforcement officials .
FBI agents visited Ms. Russell at her parents鈥� home in North Kingstown, R.I., on Monday. They left the house carrying bags labeled 鈥淒NA samples,鈥� which will be used to see if the DNA belongs to Russell or the couple鈥檚 3-year-old daughter, . Russell has been staying with her parents since April 19, when Tamerlan Tsarnaev died after a shootout with police.
"The FBI is there as part of our ongoing investigation, but we aren't permitted to discuss specific aspects of the case," FBI spokesman Jason Pack told the Journal.
Russell has not been charged in the plot, and investigators say she is not currently a suspect. Her lawyer, Amato A. DeLuca, has said that his client was shocked to learn of her husband鈥檚 alleged involvement in the attacks, and she has been cooperating with the investigation.
鈥淲e want to state what we stated before: Katie continues to assist in the investigation in any way that she can,鈥� he to The New York Times on Monday.
Police found materials used to make the bomb in the apartment where Russell and her husband lived in Cambridge, Mass., . But Mr. DeLuca said Russell did not know about her husband鈥檚 activities because she worked when Mr. Tsarnaev was at home watching their daughter.
Even if the female DNA turns out to be Russell鈥檚, it is not proof that she participated in building the bomb or plotting the attack, experts say.
鈥淚t certainly becomes a circumstantial piece that says she may have handled the device or parts of the device and that opens the door she may have known,鈥� said John Miller, a former assistant FBI director, Tuesday on 鈥�CBS This Morning.鈥�
"What they found in the apartment was black powder and parts, but not the workbench you would need to have to make these bombs. They are still looking for that, another place,鈥� Mr. Miller said.
A law enforcement official told the Times that the FBI does not believe that the Tsarnaev brothers were connected with a terrorist network, but there is skepticism about whether other people knew about their plans or helped them destroy evidence. There is no hard evidence to support that theory, but it鈥檚 possible that people close to the Tsarnaevs may have unknowingly disposed of evidence, officials told the Journal.
