Saad bin Laden had reportedly travelled to Syria to oversee weapons shipments to Hizbullah during the war.

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Saad bin Laden also helped one of his father's wives and several of his father's children to move from Pakistan to Iran, officials said.

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Men such as Saad Bin Laden and Saif al-Adel continue to plan attacks from Iranian territory, such as the massive Casablanca bombings in 2003.

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Some of the group's senior figures - including Osama Bin Laden's son, Saad Bin Laden, and former security chief Saif al-Adel - are said to have fled to Iran after the US-led invasion of Afghanistan in 2001.

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According to U.S. documents and officials, in addition to Abu Ghaith, other members of bin Laden's inner circle ended up in Iran, including the formidable military commander of al Qaeda, Saif al-Adel, and Saad bin Laden, one of the al Qaeda leader's older sons who has played some kind of leadership role in the group.

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According to U.S. documents and officials, in addition to Abu Ghaith, other members of bin Laden's inner circle ended up in Iran, including the formidable military commander of al Qaeda, Saif al-Adel, and Saad bin Laden, one of the al Qaeda's leader older sons who has played some kind of leadership role in the group.

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The haul this time might include men believed to be al-Qaeda's chiefs of military planning, finance and public relations, as well as Osama bin Laden's eldest son, Saad.

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These included at least one of his wives, two sons - Khalid, who was killed with Bin Laden in the 2011 US raid on Abbottabad, and Saad, who was killed in 2009 - and one daughter, Iman.

BBC: Canada train plot: Iran's al-Qaeda problem