It is estimated that since the start of the Syrian conflict in 211,over 3, foreign fighters have joined Sunni militant groups,such as ISIS and al-Qaeda,in Iraq and Syria. The Middle East,with

The conflict embroiling Syria hit another benchmark: the war’s number of foreign fighters now tops Afghanistan in the 198s. Syria has become the training ground of choice for today’s violent jihadis

The exodus of more than 4 million refugees from Syria since 211 raises questions about whether Syrian refugee concentrations will become incubators for violent extremist groups. This Perspective takes