AN Al-Qaeda group has posted a documentary that gloats over the 9/11 attacks which it boasted "stunned the world and changed its course forever".

       The propaganda video has been shared as American marked 20 years since 3,000 people were slaughtered after terrorists hijacked airlines smashed into the Twins Towers in New York and the Pentagon, Washington DC.

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       This still from the video seemingly shows a terrorist with a burning skyscraper behind him Credit: SITE Intelligence Group 6

       The propaganda video gloated on the attack and showed images of future attacks Credit: SITE Intelligence Group 6

       The video also shows images of Taliban troops Credit: SITE Intelligence Group

       The 60-minute video appears to show a pro-Al-Qaeda media group claiming the Taliban takeover of Afghanistan as a victory for the murderous terror group.

       Rita Katz, of the global terrorist monitoring group Site Intel, said: "The video uses clips from Taliban media, showing its fighters.

       "Yet another signal of the importance of the Taliban in the global jihadist movement’s narrative since 9/11, and how the Taliban's victory in Afghanistan is also al-Qaeda's victory."

       This pro-AQ campaign has been nonstop since 6am, showing the same intensity of ISIS’ social media campaigns of previous years

       Rita Katzglobal terrorist monitoring group Site Inte

       Ms Katz, who was tweeting her analysis, said the terror group’s propaganda units have been outpouring with 9/11 celebrations and incitements with posters, videos, hashtags since the earlier hours."

       The ISIS-style promotion has been targeting the messaging app Telegram which has been battling to delete the content.

       She said: "Entire channels, groups, bots, and members are dedicated to 9/11 right now, with all groups pumping out content."

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       Ms Katz said: "It is a very organized and thoroughly prepped campaign — nothing like what I've seen in previous years.

       "After weeks of promotion, one pro-AQ media unit releases documentary-style video on 9/11, describing the planning and its effects that 'stunned the world and changed its course forever'."

       The video also uses clips from Taliban media, showing its fighters.

       "This pro-AQ campaign has been nonstop since 6am, showing the same intensity of ISIS’ social media campaigns of previous years."

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       Flames spew out of 2 World Trade Center after it is struck by a commercial airliner in a terrorist attack on September 11, 2001 Credit: Getty 6

       One World Trade Center, known as the North Tower, collapses, the other one went minutes later Credit: Eyevine

       Notably, she pointed out Al-Qaeda leader Ayman al-Zawahiri shown in the video even though reports in November claimed he had died.

       Al-Zawahiri — sometimes dubbed Dr Death — last appeared in a video message for the group on the 19th anniversary of the 9/11 terror attacks.

       Osama bin Laden who was shot in the head in front of his screaming wife during a dramatic raid by US Special Forces in the early hours of May 2, 2011.

       The mass murderer and his group forged a close alliance with the Taliban when the fanatics last ruled Afghanistan, which they used as a base for launching a series of terror attacks on US targets, culminating in the September 11 onslaught.

       The Taliban refused an American demand to hand over bin Laden, prompting US forces to enter Afghanistan and drive them from power with the help of the Northern Alliance of local warlords.

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       Grinning mass murderer Osama bin Laden masterminded the attack Credit: Alamy

       Just a month later, American and British forces invaded the country and toppled the Taliban and a “war on terror" ensued.

       Faulty intelligence about "weapons of mass destruction" then led to the two countries launching a 2003 invasion of Iraq and the overthrow of evil dictator Sadam Hussein.

       Insurgents then launched a battle against the occupying forces

       The American-led coalition left in 2011 after 4,825 troops died and 35,000 were injured.

       An estimated 151,000 to 1,033,000 Iraqis died.

       After a two-decade occupation, U.S. forces abruptly pulled out of Afghanistan last month, triggering the collapse of its Western-backed government and the Taliban's dramatic return to power — just days before the 20th anniversary of 9/11.

       Bidens, Obamas and Clintons pay respects in moment of silence in during 9/11 remembrance service in NYC

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