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Iraq's former finance minister has told Sky News that Islamic State is nearly bankrupt and is running out of money to pay its fighters.
At its peak, IS was the richest terrorist organisation in the world - with a huge network of criminal enterprises to finance its network.
The oil fields it captured in northern Iraq, and later set fire to, still belch out thick and acrid smoke.
As the group retreated, it destroyed them to form smoke shields and make it more difficult for coalition jets to carry out airstrikes.
Oil smuggling was perhaps the group's biggest source of income.
But it also taxed and extorted money out of the local population.