Female DNA Discovered on Boston Bomb

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BOSTON, MA - APRIL 15: In this image released by the Federal Bureau of Investigation (FBI) on April 18, 2013, two suspects in the Boston Marathon bombing walk near the marathon finish line on April 15, 2013 in Boston, Massachusetts. The twin bombings at the 116-year-old Boston race resulted in the deaths of three people with more than 170 others injured.  (Photo provided by FBI via Getty Images)
Photo: Handout/2013 FBI

At least one of the explosives used in the attack on the Boston Marathon had a woman's DNA on it, The Wall Street Journal reports. It could be nothing: "The genetic material could have come, for example, from a store clerk who handled materials used in the bombs or a stray hair that ended up in the bomb." But just in case, the FBI collected a DNA sample from Tamerlan Tsarnaev's widow Katherine Russell, "the culmination of days of negotiations."