Fake passports are considered to be a serious threat to the security of European nations, Frontex director Fabrice Leggeri said.
Besides, the influx of Middle East asylum seekers to Europe can hardly be controlled which is a serious threat as well.
Currently, militants of terrorist groups may have had at their disposal thousands of passports, Sputnik News reports.
US media citing a report by Homeland Security Investigations has previously reported that ISIL (Daesh) militants may actually have equipment needed to print forged passports, and that some of them using such documents may have entered the US.