Female DNA has been found on at least one of the home-made bombs used in the Boston Marathon attack, The Wall Street Journal reported on Monday.
The significance of the finding is still unclear. Investigators have not determined whose DNA it is, and officials who spoke with the Journal cautioned that there could be several explanations for why the DNA was found on remnants of the exploded devices. For example: The DNA could have come from a store clerk that handled some of the material used in the bombs.
The Journal also reported, citing an anonymous law enforcement official, that FBI agents on Monday visited the Rhode Island home of the parents of Katherine Russell, the widow of Tamerlan Tsarnaev. According to the official, the agents went to the house on Monday to collect a DNA sample from Russell.
From the Journal:
Investigators have no evidence that any of the associates had knowledge of the bombing plot, and they believe that if anyone helped to dispose of evidence—a point that remains uncertain—it may have been unwitting, according to officials briefed on the investigation.
