The al-Qaeda terrorist organization published on Sunday a book written by a leader of the group with details about the preparation of the attacks on the Twin Towers and the Pentagon on September 11, 2001, 21 years after the attacks.

The 250-page book, according to News to the Minute, is attributed to Abu Mohamed al-Masri, a senior member of the Islamic fundamentalist organization who died in 2020 in Iran.

The author reports that the attacks began to be prepared when they set up shop in Afghanistan in 1996, and were intended to drag the United States into a long war of attrition.

The idea, according to the author of the work, came when an Egyptian pilot suggested crashing a civilian airliner with thousands of gallons of fuel into an "important and symbolic American building," explains the book, now published by Al-Qaeda, As Sahab.

"Thus, some militiamen underwent special combat training in 1998 and then enrolled in flight schools in different parts of the world," reports the piece also cited by several news sites.

And the rest are facts that everyone knows.

Finally, on September 11, 2001, Al-Qaida members hijacked four civilian airliners in different parts of the United States.

Two of them hit the Twin Towers in New York, another collided with the Pentagon, the headquarters of the Defense Department, and the last one crashed in Pennsylvania after the hijackers were shot down by passengers to prevent another attack.

These attacks triggered the invasion of Afghanistan, and what the US called the "war on terror".

Al-Qaeda leader Osama bin Laden was killed in a US military operation in Pakistan in 2011 and his successor, Ayman al-Zawahiri, was killed on July 31 in a US drone strike in the Afghan capital, Kabul.