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A huge haul of intelligence on ISIS plots to attack Britain and Europe has been found as the jihadis lose their fight for Mosul.

Computers, documents, hard drives and phones recovered as the Islamic State retreats in Iraq are proving to hold a treasure trove of information.

It includes important evidence of plans to launch attacks on European soil - and more is expected to be found when Mosul falls.

Major Gen Rupert Jones said the capture of Manbij, an outpost used as a gateway into Turkey, was an intelligence breakthrough.

(Image: Getty)

He said: “A huge amount of intelligence gathered in Manbij related to threats in Europe and elsewhere.”

Intelligence analysts are now being flown in to trawl through the data in the hope of exposing new information about ISIS terror attacks, as well as its funding and propaganda network.

It comes after prosecutors in Paris said five suspects arrested in France on suspicion of planning attacks on security target - including Disneyland - were working for Islamic State.

Authorities believe the attacks had been planned for December 1 against police and intelligence headquarters in Paris as well as the Disneyland attraction .

France is already under a state of emergency, with soldiers patrolling the streets of the capital, following bomb and shooting attacks by Islamic militants in November 2015 which killed 130 people.

“An imminent attack was thwarted,” Paris Prosecutor Francois Molins told a news conference.

“A Strasbourg commando team, and also a man arrested in Marseille, were given instructions to acquire arms. The instructions were given by a commander from the Iraqi-Syrian region via encrypted apps,” he said.

Hand-written documents pledging allegiance to Islamic State and glorifying martyrdom were found at a house in Strasbourg, eastern France, Molins said.

(Image: Reuters)

Two of the five suspects had traveled to the Turkey-Syria border via Cyprus in March 2015, he said. Four of the men are French, while a fifth is Moroccan.

Police meanwhile continued searching for an armed man after finding a dead woman in a retirement home where some 60 missionaries were living near Montpellier in southwestern France, sources close to the investigation said on Friday.

One source said a caretaker had contacted the police after freeing herself after being bound and gagged by the suspect.