„Based on the accounts of operatives arrested so far, the Emni [the intelligence unit of the Islamic State, which has become a combination of an internal police force and an external operations branch, dedicated to exporting terror abroad] has become the crucial cog in the group’s terrorism machinery, and its trainees led the Paris attacks and built the suitcase bombs used in a Brussels airport terminal and subway station. Investigation records show that its foot soldiers have also been sent to Austria, Germany, Spain, Lebanon, Tunisia, Bangladesh, Indonesia and Malaysia.
With European officials stretched by a string of assaults by seemingly unconnected attackers who pledged allegiance to the Islamic State, also known as ISIS or ISIL, Mr. Sarfo suggested that there may be more of a link than the authorities yet know. He said he was told that undercover operatives in Europe used new converts as go-betweens, or ‚clean men,‘ who help link up people interested in carrying out attacks with operatives who can pass on instructions on everything from how to make a suicide vest to how to credit their violence to the Islamic State. The group has sent ‚hundreds of operatives‘ back to the European Union, with ‚hundreds more in Turkey alone,‘ according to a senior United States intelligence official and a senior American defense official, both of whom spoke on the condition of anonymity to discuss intelligence.“
(Rukmini Callimachi: „How a Secretive Branch of ISIS Built a Global Network of Killers“)