Data from fallen Raqqa identifies 19,000 of 40,000 foreign fighters

The Soufan Center, a US-based think tank, says 33 states have reported that about 5,600 Islamic State fighters have returned home in the past two years. Data recovered from Raqqa and other ISIS centers which have fallen in Syria and Iraq have helped confirm the identities of 19,000 of the more than 40,000 foreign fighters from 110 countries estimated to have flocked to the jihadist flag in Iraq and Syria. They include 400 of the 3,417 fighters from Russia; 760 of the 3,244 from Saudi Arabia; 800 of the 2,926 from Tunisia; 271 of the 1,910 from France and half the estimated 850 people who left the UK. The data does not reveal what happened to the majority, and unknown figures from other countries represent a huge challenge for security and law enforcement entities.