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The footage comes just hours after David Cameron called for Britain to join France, the US and Russia in launching air strikes in Syria.

One man said in ISIS' video: "We say to the states that take part in the crusader campaign that, by God, you will have a day, God willing, like France's and by God, as we struck France in the centre of its abode in Paris, then we swear that we will strike America as its centre in Washington."

The footage has not yet been verified.

(Image: IG) (Image: GETTY)

Islamic State fighters in the Iraqi province of Salahuddine have claimed to have published the footage.

The French government has called the Paris attacks an act of war.

And despite pressure from some quarters to stop air strikes, President Francois Hollande seems determined to push on.

Through the night 20 bombs were dropped on ISIS' stronghold in Syria, Raqqa.

The operation was carried out in coordination.

(Image: IG) (Image: EPA)

A voice in the video also warned that ISIS was "much stronger than before".

The unidentified voice said: "I say to the European countries that we are coming, coming with booby traps and explosives, coming with explosive belts and (gun) silencers and you will be unable to stop us."

Another man identified in the video as "Al Karrar the Iraqi" tells French President Francois Hollande "we have decided to negotiate with you in the trenches and not in the hotels."