Female DNA has been found on one of the bombs used during the Boston Marathon bombings. A fingerprint and DNA were recently lifted off of a bomb fragment. It is so far unknown if the fingerprint was there before the bomb exploded or if the fragment was touched after the explosion. The FBI is currently questioning all females that could have been in contact with the Tsarnaev brothers, including the widow of Tamerlan, Katherine Russell. The female DNA was found on the pressure cooker that held the bomb. Read more below.