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Social media posts uncovered by an intelligence agency show ISIS supporters gloating about the London Bridge attack - and claiming that it was a revenge strike for a Royal Air Force missile bearing a 'message from Manchester'.

The RAF hellfire missile, with the words 'Love from Manchester' and a heart scrawled on the side of it in pen, was bound for Syria and its message was the work of a drone squadron stationed in the Middle East at a secret location.

It was originally thought the image was a social media hoax, but RAF bosses confirmed that it was genuine on May 25.

Now, ISIS supporters are claiming the London Bridge attack that killed seven was a revenge strike for the message.

(Image: @Rita_Katz/Twitter)

It was unearthed that a photo of the missile was posted online by terrorist sympathisers with the chilling caption: "This is your Merchandise and tonight we responded.."

The image was discovered and shared by Rita Katz, a terrorism analyst and co-founder of private intelligence firm Search International Terrorist Entities Intelligence Group.

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She explained she had collected posts from 'Pro-ISIS channels' who 'continue to celebrate [the London attack] as "the black days we've promised, the wolves have awakened."

Katz also shared an image from a pro ISIS channel encouraging their followers to 'run over crusaders' with vehicles.

When the original image emerged on May 25, an RAF spokesperson told Mirror Online: “The RAF can confirm the photo was genuine”.

A source added: “There’s a history of messages being written on missiles in the RAF.

“It’s unlikely the individual responsible for it will be disciplined.”

Mirror readers were unimpressed with the message, with one saying: "I may be wrong but I don't think this is helpful."

Another added: Not in our name. It's this sort of attitude that gives terrorists motivation."

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The Ministry of Defence could not comment on the claims when contacted today, saying it was a matter for Met Police conducting the investigation.

Rita posted more pictures from other ISIS supporters, including one of a London map showing where the attacks had taken place, with the caption: "Three attacks in one hour hit #London. We are coming for you from Iraq and Sham!"

Another contained what looked like a promotional poster - almost as if it were marketing a film - showing terrorists with knives and guns.

It read: "Let Paris be a lesson for those nations that wish to take heed."

The poster was shared with the caption: "Crusading #brits now living in a state of terror and fear! Where is your great kingdom now?" along with hashtags for London Bridge, Borough Market and Vauxhall.

(Image: Gabriele Sciotto)

Seven people were killed last night when three men mowed down pedestrians on the bridge before running towards Borough Market with 12-inch knives, stabbing and slashing people at random.

Forty-eight people were being treated for injuries in five London hospitals today, with 21 in a critical condition.

Twelve have been arrested in connection with the terror attack.

Twenty-two innocent victims died on May 22 when monster Salman Abedi detonated a 'dockyard confetti' bomb in the foyer of Manchester Arena at the end of an Ariana Grande concert.

Among the dead were children.

A concert is being held in Manchester United's football ground, Old Trafford, tonight as a tribute to the victims. Follow updates from the One Love Manchester concert here.