How ISIS amassed a fortune

An ISIS militant stands guard at a checkpoint captured from the Iraqi Army outside Beiji refinery, 155 miles north of Baghdad, on June 19.
An ISIS militant stands guard at a checkpoint captured from the Iraqi Army outside Beiji refinery, 155 miles north of Baghdad, on June 19.

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    How ISIS amassed a fortune

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Hala Gorani speaks to Middle East experts Sam Jones and Fawaz Gerges about how ISIS acquired the fortunes it runs on.