ISIS militant in James Foley beheading video has been identified: FBI director

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(CNN) -- The United States believes it has identified the ISIS militant in the video showing American journalist James Foley's killing, FBI Director James Comey said Thursday.

Since August, ISIS has beheaded Foley, American journalist Steven Sotloff and British aid worker David Haines, gruesomely showing their killings in videos posted online.

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