An operative working for Islamic State has revealed the terror group has successfully smuggled thousands of covert jihadists into Europe, reports.

The Syrian operative claimed more than 4,000 covert ISIS gunmen had been smuggled into western nations – hidden amongst innocent refugees.

The ISIS smuggler, who is in his thirties and is described as having a trimmed jet-black beard, revealed the ongoing clandestine operation is a complete success.

The Islamic State operative spoke exclusively to BuzzFeed on the condition of anonymity and is believed to be the first to confirm plans to infiltrate western countries.

Islamic State, also referred to as IS and ISIS, is believed to be actively smuggling deadly gunmen across the sparsely-guarded 565-mile Turkish border and on to richer European nations, he revealed.

They are following the well-trodden route taken by refugees and migrants fleeing, travelling across the border of Turkey then on boats across to Greece and through Europe.

There are now more than 4,000 covert ISIS gunmen “ready” across the European Union, he claimed.