FBI Director James Comey said Sunday he knows of roughly a dozen Americans fighting with the Islamic State, but acknowledged there could be more.
Comey made the assessment during an interview with CBS's '60 Minutes,' his first major TV interview since he began running the agency in September 2013.
Comey said he would do everything in his power to monitor the militant fighters if they return to the United States, amid fears they would launch a terror attack on American soil.
However, he said American citizens essentially have the right to freely enter and exit the United States.
'Ultimately, an American citizen, unless their passport is revoked, is entitled to come back,' Comey told CBS. 'So someone who has fought with (Islamic State) with an American passport and wants to come back, we will track them very carefully.'
As he told Congress several weeks ago, Comey said cyber crime is the looming threat about which most Americans are not wary.
He said one of his top priorities is to improve the agency's capability against such cyber crimes as ID theft and industrial espionage.
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