(CNN) The Islamic State in Iraq and Syria has crude, stomach-turning tactics when it comes to dealing with its enemy, but experts say that its moneymaking methods are highly sophisticated, especially for such a new terror group.
ISIS makes between $1 million and $2 million each day from oil sales, numerous sources tell CNN. The oil comes mostly from refineries and wells that ISIS controls in northern Iraq and northern Syria.
The militants smuggle oil into southern Turkey, for example, and sell it to people who desperately need it just to carry on some semblance of everyday life.
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The United States-led coalition fighting ISIS has repeatedly targeted ISIS oil assets in an effort to, in part, damage this arm of the group's financial system.