Career
According to Ron Suskind's One-percent Doctrine, he was the mastermind of a planned cyanide gas attack on both the New York City Subway and the PATH (both of which were canceled shortly before they were to happen). Born in Dammam, Saudi Arabia, at age 18 Ayeri traveled to Afghanistan where he received paramilitary training in the Al Farouq training camp, he would go on to become a trainer at the camp. Ayeri briefly served as a bodyguard of Al Qaeda leader Osama Bin Laden, with whom he traveled to Sudan.
The leader of the Somali militant Islamist group Al-Shabaab, Moktar Ali Zubeyr, has said that Saif al-Adel and Yusef al-Ayeri played an important role in the 1993 Battle of Mogadishu by providing training and participating in the battle directly. After the 1996 Khobar Towers bombing in Saudi Arabia, Ayeri was arrested by Saudi authorities and tortured. After 2 years he was released and was tasked by Bin Laden with organizing Al Qaeda’s branch within Saudi Arabia.
Before his death, he also wrote a number of strategic documents on Al-Qaeda. According to Ron Suskind's One-percent Doctrine,
Al-Ayeri was killed in 2003 in a gun-battle with Saudi security forces as part of the crackdown on Islamic insurgency in Saudi Arabia. His brother-in-law is the Saudi Cleric Sulaiman Al-Alwan.
