The Rhode Island home of Katherine Russell Tsarnaev’s parents have been visited by FBI agents reportedly to take a sample of her DNA after traces of a woman were found on one of the bombs used in the Boston Marathon attacks.

Spokesman Jason Pack confirmed that agents investigating the Boston bombings visited the North Kingstown home of Katherine Russell’s parents, where Tamerlan Tsarnaev’s widow has been staying since the attacks.

According to The Wall Street Journal, FBI agents went to the house today to collect a DNA sample from Katherine Russell in a bid to rule out her involvement in the bombings.

An official close to the case told the newspaper that female DNA has been found on at least one of the bombs used in the Boston Marathon attacks. Though investigators haven’t determined whose DNA it is or whether the DNA means a woman helped the two suspects carry out the bombings.

FBI agents investigating the Boston bombings visited the North Kingstown home of Katherine Russell’s parents, where Tamerlan Tsarnaev’s widow has been staying since the attacks

Jason Pack said the FBI visited the house as part of its investigation into the April 15 blasts, which killed three people and injured hundreds more.

“The FBI is there as part of our ongoing investigation, but we aren’t permitted to discuss specific aspects of our case,” the agency said in a statement.

After agents finished their job, Katherine Russell Tsarnaev, 24, left with her attorneys through a separate door. She was later photographed smiling as she left a Providence law center with her attorney.

Katherine Russell’s attorneys have previously said she and her family were in shock when they learned of the allegations against her husband Tamerlan and brother-in-law, Dzhokhar Tsarnaev.

Tamerlan Tsarnaev, 26, was killed in a gun battle with police while surviving suspect 19-year-old Dzhokhar Tsarnaev has been charged with using a weapon of mass destruction.

No one has yet come to claim Tamerlan Tsarnaev’s body, which is in the custody of the Office of Chief Medical Examiner, said Department of Public Safety spokesman Terrel Harris.

The medical officer has determined Tamerlan Tsarnaev’s cause of death, but won’t release the information until the body has been claimed, Terrel Harris told The Boston Globe.

Katherine Russell converted to Islam before marrying Tamerlan Tsarnaev and having his child, 3-year-old daughter, Zahara.

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