August 22, 2014 -- Updated 2053 GMT (0453 HKT) Edited by Simon Rushton in Atlanta

Although James Foley's killer is masked in black, some distinguishing features can be picked out -- but the biggest clue may be in his voice. NEW CLUES POINT TO 'EDUCATED' KILLER  CLUES POINT TO 'EDUCATED' KILLER

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Calling ISIS "evil" makes it easier to kill its fighters but we should also try to understand them.
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