The European Union’s border agency admitted Tuesday it cannot fully track the flood of refugees pouring in, and said a “staggering number” of Europeans have joined terror groups only to return to the continent amid the migrant wave.

Europe reported a record 1.82 million illegal border crossings last year, according to Frontex, but the group conceded that the true number of illegal crossings is probably much higher because so many refugees have entered Europe undetected.

“The Paris attacks in November 2015 clearly demonstrated that irregular migratory flows could be used by terrorists to enter the EU,” the report said. “With no thorough check or penalties in place for those making such false declarations, there is a risk that some persons representing a security threat to the EU may be taking advantage of this situation.”

Two extremists involved in the Paris attacks entered through the Greek island of Leros and registered with Greek authorities using fraudulent Syrian documents, The Telegraph reported. The route through the Greek islands accounted for the largest number of detections – more than 885,000.

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