August 21, 2014 -- Updated 1927 GMT (0327 HKT) Edited by Simon Rushton in Atlanta

The video of James Foley's brutal execution shows another hostage, Steven Sotloff whose life, the killer says, is in the balance. Other Western hostages also hold potential value for the terrorists. FULL STORY

ISIS tactics are galvanizing an unlikely coalition, with the U.S., Iran and an al Qaeda affiliate sharing an enemy, but tackling ISIS means taking on seasoned fighters with serious weapons. FULL STORY

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