At least 1,200 migrants from Syria and Afghanistan have landed in Greece over a two-day period, the Daily Mail reports Wednesday, flooding the islands of Kos, Lesbos, Chios and Farmakonisi. 30,000 have arrived in the past year alone.
Migrants have been smuggled in from the Turkish border, according to the news agency, with the average smuggling price at 800 euros ($870) per head.
The islands have become severely littered and overcrowded from the influx, as the inflatable rafts carrying refugees are left on the beaches and police stations meant for fewer than 40 people are now home to at least 200.
Greek authorities are reportedly threatening to deport at least 10,000 people being held in detention centers over a number of fears, including the European Union dangling austerity measures over the country, fears that accepting the migrants will encourage a mass exodus to the rest of the EU, and links to terrorism.
Already, a Libyan official told BBC earlier this month that ISIS jihadists were actively infiltrating Europe by being smuggled across the Mediterranean Sea as "migrants" or "refugees" seeking asylum.
Italy, in particular, insisted as far back as February that ISIS was slowly invading on small boats.