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Departing FBI chief worries about airborne terror
The nature of terrorism has changed in Robert Mueller's dozen years as FBI director, but his concerns for the future are much the same as when terrorists struck on Sept. 11, 2001, merely a week after he had taken over the bureau.

 

As he wraps up his FBI tenure, Mueller worries that terrorists will once again target planes or finally pull off an attack using a weapon of mass destruction. (AP)