The handwritten will of Osama bin Laden has revealed the former al Qaida leader had about 29 million US dollars (£20.8 million) in personal wealth - the bulk of which he wanted to be used "on jihad, for the sake of Allah".

The will was released in a batch of more than 100 documents seized during the May 2011 raid that killed bin Laden at his compound in Abbottabad, Pakistan.

Bin Laden planned to divide his fortune among his relatives, but wanted most of it spent on carrying out the work of the Islamic extremist terror network behind the September 11 2001 attacks.

The threat of sudden death was on his mind years before the fatal raid in Pakistan.

"If I am to be killed," he wrote in a 2008 letter to his father, "pray for me a lot and give continuous charities in my name, as I will be in great need for support to reach the permanent home".

The documents were released by the US Office of the Director of National Intelligence.

They address a range of topics, including fractures between al Qaida and al Qaida in Iraq, which eventually splintered off into what is now known as the Islamic State; and bin Laden's concerns about his organisation's public image.

In another letter, addressed to "The Islamic Community in General," bin Laden offered an upbeat assessment of progress in his holy war and of US failings in Afghanistan. The letter is undated but appears to have been written in 2010.

He wrote: "Here we are in the tenth year of the war, and America and its allies are still chasing a mirage, lost at sea without a beach."

"They thought that the war would be easy and that they would accomplish their objectives in a few days or a few weeks, and they did not prepare for it financially, and there is no popular support that would enable it to carry on a war for a decade or more."

Bin Laden sought to portray the US as mired in an unwinnable war in Afghanistan.

In an undated letter that appears to have been written in the 2009-2010 period, he compared the American combat position to that of the Soviet Union in the final years of its occupation of Afghanistan in the 1980s.

"America appears to be hanging on by a thin thread," he wrote. "We need to be patient a bit longer. With patience, there is victory."

Beginning last summer, the CIA led an inter-agency review of the classified documents under the auspices of the White House's National Security Council staff. Representatives from seven agencies combed through the documents.

The review is ongoing, with the next release expected later this year.

Shortly before his death, bin Laden hailed the overthrow and death of Libya's leader Muammar Gaddafi. In a February 25 2011 letter addressed "to our people in Libya," bin Laden said al Qaida had triumphed.

He wrote: "Praise God, who made al Qaida a great vexation upon him, squatting on his chest, enraging and embittering him, and who made al Qaida a torment and exemplary punishment upon him, this truly vile hallucinating individual who troubles us in front of the world."

Sign up to our free newsletters

Get the best updates straight to your inbox:
Please select at least one mailing list.

You can unsubscribe at any time by clicking the link in the footer of our emails. We use Mailchimp as our marketing platform. By subscribing, you acknowledge that your information will be transferred to Mailchimp for processing.