The FBI has found female DNA on fragments from the bomb used in the Boston Marathon bombing, CBS News reports.

"While the DNA could have come from a marathon spectator or a clerk who sold the bomb-making materials, investigators say it's possible it came from a female accomplice," reports CBS News.

The FBI will compare the sample of female DNA found on the bomb with DNA taken from the widow of Tamerlan Tsarnaev, Katherine Russell. According to CBS, the FBI is not looking at Russell as a suspect. They are testing to see if she ever came in contact with the bomb while her husband was building it.

Katherine Russell Tsarnaev's identity was released after the bombing. In the court of public opinion, she knew what her husband was up to. Comments left on various media sites covering her story saw the government should lock her up until she speaks.

People that knew Tsarnaev's wife before they met say her husband had her brainwashed. Katherine grew up a simple Christian girl with dreams of life after college.

After becoming involved with Tsarnaev Russell was a college drop out, Islam convert and a mother by the age of 21.

The FBI still has to test the DNA to find out who the female is that came in contact with the pieces of the bomb.

According to CBS, the FBI is taking a deeper look into a trip Tamerlan Tsarnaev took to Russia for 6-months. The FBI wants to know if while in Russia Tsarnaev met with terrorist extremists.

"Of particular interest is a Russian-born Canadian militant named William Plotnikov," CBS reports.

Tamerlan Tsarnaev's younger brother and second bomber Dzhokhar Tsarnaev is currently in federal custody. He is being held in isolation. The terrorist refuses to speak with investigators.