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When ISIS militants took over Mosul in Iraq, they marched into banks and looted a great deal of money and gold bullion. Its new found wealth makes it the world’s richest terrorist organisation – as one analyst tweeted, their cash will "buy a whole lot of jihad". Dr Peter Neumann is Professor of Security Studies at King's College London, and Director of the International Centre for the Study of Radicalisation. How much money do they have?

(Photo: ISIS militants lead away captured Iraqi soldiers dressed in plain clothes after taking over a base in Tikrit, Iraq. Credit: AP Photo via militant website)