MOSCOW, April 30 (RAPSI) - FBI agents collected DNA samples from Katherine Russel, the widow of deceased Boston Marathon bombing suspect Tamerlan Tsarnaev, the Wall Street Journal reported Monday.

FBI agents collected DNA samples from Katherine Russel, the widow of deceased Boston Marathon bombing suspect Tamerlan Tsarnaev, the Wall Street Journal reported Monday.

Female DNA was found on at least one of the bombs used in the Boston Marathon attacks, although investigators do not yet know whose DNA it is, or whether it proves that a woman helped the two brothers suspected in the bombings, according to the WSJ report, which noted that the DNA may have come from a store clerk, for example, who handled the material used in the bombs, or just a stray hair which ended up in one of the bombs.

Two blasts occurred on April 15 at the finish line of the Boston Marathon, America’s most prestigious 26.2-mile race boasting such stringent entry requirements that only the best of the best are entitled to compete.

Three people have been confirmed dead, including an eight-year-old boy who had come to cheer on his father. More than 180 people were reported as injured.

Brothers Dzhokhar and Tamerlan Tsarnaev, aged 19 and 26 respectively, are suspected of having detonated two bombs made from pressure cookers at the Boston Marathon on April 15. On April 19, Tamerlan was killed in a shootout with police. Dzhokhar was captured several hours later after a manhunt that shut down much of Boston and the surrounding areas.

According to the WSJ, Russell, 24, converted to Islam to marry Tamerlan Tsarnayev. They have a three-year-old daughter, Zahara. Ms. Russell’s lawyers said she is cooperating with the authorities over the investigation.