FBI agents investigating the Boston Marathon bombings have questioned the wife of dead suspect Tamerlan Tsarnaev.<br /><br />Local media report officers visited Katherine Russell after traces of female DNA were discovered on the bomb fragments.<br /><br />Three people were killed and 260 injured in the bomb attack.<br /><br />...<br />No Comment | euronews: watch the international news without commentary | http://www.euronews.net/nocomment/
