FRENCH cops are anxious a growing number of British-bound ISIS jihadis are hiding among thousands of refugees in the Jungle camp in Calais.

The officers fear extremists among the 7,000 migrants in the "unpoliceable black hole" are making daily attempts to cross the channel to the UK.

2 French officers fear jihadis could be living in Calais camp as they try to sneak into Britain

The sprawling camp in Calais is said to be so dangerous that officers can no longer venture there.

A senior police officer told Le Figaro newspaper: “What is going on in the camp is truly worrying. Our officers rarely penetrate into the heart of the camp.

“It is impossible to know if a jihadi from say Belgium, for example, is hiding there. The area is not policeable and has become a national security black hole.”

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Calais police union spokesman Denis Hurth added: "With the heightened terrorist risk in all of France's town and cities, we only have 1,000 officers here to tackle the most gigantic public order threats here."

Pascal Brice, head of France's Office for the Protection of Refugees, added: "Identifying high-risk individuals has now become an absolute priority for us..

"It is also imperative we root them out."

2 Cops are concerned extremists are hiding in "unpoliceable black hole" full of desperate refugees Credit: Getty Images

Fears refugees are hiding in the Jungle camp come after French anti-terror cops raided a Calais hotel last November.

They executed the raid amid concerns a jihadi cell was using it as a base to sneak into the UK.

Officials refused to confirm whether arrests were made or if explosives were seized.

A police source said at the time of the raid: "There are always fears terrorists are living among the thousands of illegal immigrants in Calais."