A chilling image of the Palace of Westminster on fire has been posted online by ISIS supporters.
The manipulated image shows smoke billowing out of the Elizabeth Tower - which houses Big Ben - while the rest of the Houses of Parliament's iconic Gothic building is in flames.
A hooded figure armed with a pistol is seen nearby.
The poster, which emerged via the Site Intelligence Group website, comes amid a propaganda drive by the death cult.
Several graphics depicting attacks on Western cities spread on social media in May.
One, resembling the new poster, shows a suicide bomber wrapped in an explosive vest standing beside a flaming Elizabeth Tower while the Union Jack falls.
It was captioned: 'Just Terror. London attacks coming soon.'
The poster was accompanied by two other images calling for terrorist cells to unleash violence.
One shows a balaclava-clad man wielding a knife dripping with blood standing over New York city with the caption: 'Just Terror. Fight them in your country.'
The final poster states: 'Remember O you who have believed, whoever of you should revert from his religion...
Allah will bring forth in place of them a people he will love and who will love him... who are humble toward the believers, powerful against the disbelievers... they strive in the cause of Allah and do not fear the blame of a critic.
'That is the favor of Allah, he bestows it upon whom he wills. And Allah is all encompassing and knowing.'
The propaganda posters were created by the Ash Shaff Media Foundation - a pro-ISIS outlet and posted to Twitter by the Terror Research and Analysis Consortium (TRAC) - a terrorism watchdog.
