Investigators probing the Boston Marathon blast have discovered female DNA on the fragments of the explosive device that ripped through crowds at the finish line, killing three and injuring more than 260.
The discovery raises the possibility that the bombers had at least one female accomplice.
Yesterday, Katherine Russell – the wife of bomb suspect Tamerlan Tsarnaev – met with FBI agents to provide them with a DNA sample which will prove whether she ever handled the deadly devices used in the atrocity.
However, the FBI said she was not a suspect at this stage.
Meanwhile, prominent death penalty lawyer Judy Clarke is t join the team representing the surviving Boston Marathon bombing suspect, Dzhokhar Tsarnaev.
Her clients have included Unabomber Ted Kaczynski; Susan Smith, who drowned her two children; and most recently Tucson, Arizona, shooter Jared Loughner. All received life sentences.