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(Image: AFP)

Supporters of the evil terror organisation made the chilling threats online after at least 128 people were killed in Paris, France last night.

Today David Cameron will chair a Cobra meeting where top politicans and security officials will be discuss raising Britain's terror threat to its highest possible level.

If raised to "critical" it would be the first time since June 2007 that the threat to the UK has been so high.

This morning President Hollande confirmed the atrocities in Paris were carried out by ISIS – describing the attacks as an "act of war".

The news comes as the north terminal of Gatwick Airport was evacuated with many fearing ISIS had been true to their word and struck in Britain.

(Image: AFP)

After gloating about the shocking attacks across Paris, armchair jihadists claimed London could be next.

The twisted tweeters also claimed to have two other major capitals in their sights – Washington DC and Rome.

Cops have raced to high-profile locations in Washington DC – including the US government's Capitol complex – amid fears of another 9/11.

But a spokeswoman insisted: "There is currently no known threat to the Capitol complex."

London was last hit by a terror attack in July 2005 when 52 commuters were killed by fanatics linked to al-Qaida.

But officials have reportedly been working non-stop to thwart ISIS attacks since the militants declared a caliphate last summer.

Last month MI5 chief Andrew Parker admitted the security service can "never be confident" in stopping all terror plots against Britain.

Following January's Charlie Hebdo attacks in France and the Tunisia tourist massacre in June the terror threat to the UK has remained at "severe".

(Image: IG)

British people have been warned to expect to see a surge in police numbers at public events.

Mark Rowley, the assistant commissioner for specialist operations in London, urged the UK to be vigilant and report anything suspicious to cops immediately.

He told BBC Radio 4's Today programme that terrorism can be defeated by strengthening trust within communities and the police.

He said: "We can't let the terrorists defeat us by becoming fearful and withdrawing from the streets."