Between 27,000 and 31,000 foreign fighters from 86 countries have traveled to Iraq and Syria compared to a figure of around 12,000 foreign fighters when a similar study was published in June 2014.
The number of foreign fighters joining ISIS and other extremist groups in Iraq and Syria has more than doubled since last year to at least 27,000, a report by an intelligence consultancy has revealed.
The figures, compiled by The Soufan Group, indicate that efforts by countries around the world to stem the flow of foreign fighters to the region and blunt the appeal of violent organisations appear to have made little impact.
'The foreign fighter phenomenon in Iraq and Syria is truly global,' the New York-based security consultancy's report said.
'The Islamic State has seen success beyond the dreams of other terrorist groups that now appear conventional and even old-fashioned, such as Al Qaeda.
'It has energised tens of thousands of people to join it, and inspired many more to support it.'
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'We've made some progress in reducing the number of foreign fighters'