The year-long study carried out by King's College London confirmed that up to 600 people from 14 European countries including the UK, Austria, Spain, Sweden and Germany are fighting the popular government of President Bashar al-Assad in Syria since the protests started in 2011.

The results showed the largest contingent came from the UK, with estimates of fighters running between 28 and 134, between 30 to 92 fighters were from France, between 3 to 40 from Germany, 26 from Ireland, between 14 and 85 from Belgium, and between five and 107 were from the Netherlands.

Other countries such as Spain, Sweden, Kosovo, Finland, Bulgaria, Austria and Albania were also listed as being home to a number of fighters who infiltrated the Syrian territory to join the war against the Syrian nation.
 

According to lead researcher, Prof Peter Neumann from the International Centre for the Study of Radicalization (ICSR) at King's College, European terrorists made up to between 7 percent and 11 percent of the foreign contingent in Syria, which ranged between 2,000 and 5,500 people.
 

"No one has really mapped it out across all of Europe," Neumann said. "We've brought all these figures together … it's a compilation of the open source data. We can say with certainty now that hundreds of Europeans have joined the fight in Syria."