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Heavily-armed guards could soon be patrolling ferries in the English Channel in a bid to prevent attacks by ISIS terrorists.

Officials in both France and the UK are hoping to sign a deal which will see guards on ferries travelling between the two countries.

Sources say a deal is close to being finalised which could result in French guards opening fire in British waters.

The armed marshals will be plain-clothed and will only operate on French-run vessels. It is believed the teams of armed marshals have already started trial runs in secret.

It is even thought they could begin working within a matter of weeks. Once they are fully operational , it means they could open fire in British waters in case of a terror attack.

(Image: Getty)

Speaking to the Sun, a French source said: “A deal is close. France hopes its sea marshal units will begin operations in UK waters as soon as possible.

“Both countries recognise the threats posted by Islamic terrorism."

French officials are thought to be keen to move ahead with the plan.

The country has suffered a number of devastating terror attacks and is looking to beef up security.