Oil produced from fields under the control of the Islamic State group is at the heart of a new investigation by al-Araby al-Jadeed. The black gold is extracted, transported and sold, providing the armed group with a vital financial lifeline.
But who buys it? Who finances the murderous brutality that has taken over swathes of Iraq and Syria? How does it get from the ground to the petrol tank, and who profits along the way?
The Islamic State group uses millions of dollars in oil revenues to expand and manage vast areas under its control, home to around five million civilians.