FBI Director Mueller states the three largest threats to the U.S.

During the Annual Threat Assessment of the Director of National Intelligence for the Senate Select Committee on Intelligence, FBI Director Robert Mueller says that Al-Qa'ida is a critical threat to the Homeland. He says that a second threat is self-directed groups not part of Al-Qa'ida's formal structure but that are tied to Al-Qa'ida through money or training. The third threat, he says, is "self-radicalized, home grown extremists" in the United States. They are inspired, he said, by messages of violence often through the internet and that they are difficult to detect because they lack formal ties to Al-Qa'ida. (:30)
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