How ISIS made $40m a month in oil deals

The Syrian government cut deals with Islamic State to help the jihadists earn more than $40 million a month from the sale of oil, documents recovered from a US and British raid on a key commander have revealed.

Thousands of spreadsheets and accounts kept by the group’s oil boss Abu Sayyaf, retrieved in the biggest intelligence raid in US Special Forces’ history last year, reveal how the two sides forged a mutually beneficial arrangement despite being at war with one another.

Isil fighters captured some of the state’s best-producing oil fields of eastern Syria in 2013.