Boston bombingFemale DNA found on Boston bomb fragments

FBI investigators found female DNA on fragments from the bombs used in the Marathon attack. The finding was first reported in the Wall Street Journal.

A source told Fox it was too early to draw hard conclusions from that evidence. “No one should expect that the investigation is over.”

The news coincided with a visit by FBI investigators to the Rhode Island home of Tamerlan Tsarnaev’s widow’s parents. The investigators also visited the nearby home of a family of a man identified by some as his mysterious mentor.

“We are there as part of our ongoing investigation, but we aren’t permitted to discuss specific aspects of our case,” an FBI official said outside the suburban Providence home where Katherine Russell and her 3-year-old daughter are staying.

Russell has not been named as a suspect in the 15 April bombing. She has kept a low profile since the attack. She has been living with her parents in West Kingston, Rhode Island, since her husband was killed in a police shootout.

Fox News reports that an attorney for the family of Mikhail Allakhrdov, a man who some of Tsarnaev’s family members and friends described as the mysterious “Misha” who radicalized Tamerlan, said that Allakhrdov’s parents are fearful of all the publicity the case has brought them.

The parents confirmed that their son’s nickname was Misha, and that he was what they described as a “spiritual tutor” of Tsarnaev’s some years ago. Allakhrdov, a Ukrainian Christian who converted to Islam, told the New York Times, however, that he had not been in contact with Tsarnaev for several years, and that he never encouraged him to take up violence.