The 30-year-old Saudi national [Qahtani], who was arrested two weeks ago, had been in contact with Al-Qaeda number two Ayman al-Zawahiri... Qahtani, who adopted the nom de guerre "Sinan al-Saudi," held a degree in business administration and also graduated from King Fahd Security College with the rank of lieutenant.
He entered Iraq in 2004, shortly after the US-led invasion to oust Saddam Hussein, and was involved in operations in the towns of Al-Qaim and Husayba near Iraq's border with Syria.
According to Atta, Qahtani was apprehended by the US military in 2007 under the false name Muzawar al-Shammari, and was released last year.
More recently, he participated in the planning of a series of co-ordinated attacks against Baghdad hotels in January which killed 36 people, and in the organisation of five vehicle-borne bombs that killed 127 people in the capital in December.