Former CIA Director Michael Hayden tells LIGNET in an exclusive interview that he believes the Boston Marathon bombers, Tamerlan and Dzhokhar Tsarnaev, were largely self-radicalized, and acting independent of any jihadist group. Guys like these will pose the biggest threat to American security in the future, he said, as intelligence agencies cannot effectively assess the level of the risk they pose.

Click here to watch the interview with Hayden and read the full report of his remarks at LIGNET.com.