9/11 attacks were America's fault

The self-proclaimed mastermind of the September 11 attacks wrote to former president Barack Obama to tell him 9/11 was a direct result of American foreign policy and the deaths of innocent people it has caused.

Khalid Sheikh Mohammed's 18-page letter was addressed to "the head of the snake, Barack Obama," leader of "the country of oppression and tyranny."

Defense attorney David Nevin provided a copy of the letter, which has not yet been posted on the US military's website for Guantanamo proceedings. He told AFP that Mohammed began writing it in 2014.

The letter is dated January 8, 2015, but reached the White House only two years later in the last days of Obama's presidency, according to news reports, after a military judge ordered the Guantanamo prison camp where Mohammed is held to deliver it.

"It was not we who started the war against you in 9/11; it was you and your dictators in our land," he wrote.

He says God was on the side of the hijackers on that fateful day when airplanes were guided into the Twin Towers in New York, the Pentagon and a field in Pennsylvania.

"Allah aided us in conducting 9/11, destroying the capitalist economy, catching you with your pants down, and exposing all the hypocrisy of your long-held claim to democracy and freedom," Mohammed wrote.