NEW : al Qaeda 's says withdrawal of personnel is in response to a specific threat . Security steps increase in U.S. due to intercepted al Qaeda message , other threats . A pair of suspected Yemen Interpol wants to know . drone strikes kills hundreds al Qaeda militants . `` Do something , '' ordered a message from al Qaeda 's leader to his Sanaa deputy .
NEW : al Qaeda 's says withdrawal of personnel is in response to a specific threat . Security steps increase in U.S. due to intercepted al Qaeda message , other threats . A pair of suspected Yemen drone strikes kills hundreds al Qaeda militants . `` Do something , '' ordered a message from al Qaeda 's leader to his Sanaa deputy .