After September 11th, you had core al Qaeda in Pakistan and Afghanistan with (Osama) bin Laden. Bin Laden was killed. You have al Qaeda growing in countries like Somalia, but most particularly in Yemen. And there's still substantial threat out of Yemen. And now you have the countries in the Arab Spring: Tunisia, Libya, Syria, Mali; Egypt most recently, where they're breeding grounds for radical extremists who may not stay there, but may present an attack. And, finally, you have, within the United States, the growth of homegrown, radicalized extremists who are radicalized on the Internet and then get their instructions for developing explosives on the Internet, as well.
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About Robert Mueller
Robert Mueller was a contemporary American attorney. Robert Swan Mueller III is an American lawyer who served as the sixth director of the Federal Bureau of Investigation (FBI) from 2001 to 2013. Read more on Wikipedia →