ISIS may have stolen "tens of thousands" of blank passports that it could use to smuggle its fighters into Europe as refugees, AFP reports, based on information from a German newspaper.
The Welt am Sonntag cited Western intelligence sources as saying that ISIS could have acquired the stolen travel documents in areas of Syria, Iraq and Libya it now controls.
The passports could be issued to would-be attackers to enter the European Union as asylum seekers, according to the report.
Moreover ISIS has already launched a money-spinning operation with the fake documents, selling them on the black market where they fetch up to €1,500 ($1,630) each, Welt said.