ISIS believed to make $ 250 million more each year than previously thought . Income generated from oil sales , organ harvesting , extortion and ransoms . Militants also believed to make $ 1billion a year from drug sales - with half the heroin in Europe now thought to have come via ISIS . Comment:
ISIS believed to make $ 250 million more each year than previously thought . Income generated from oil sales , organ harvesting , extortion and ransoms . Militants also believed to make $ 1billion a year from drug sales - with half the heroin in Europe now thought to have come via ISIS . Revised income means ISIS is now the wealthiest jihadi group in history .