The Washington Post reports that an FBI agent and a flight school official in Minnesota discussed the possibility that Zacarias Moussaoui, the alleged 20th hijacker, might have been plotting a hijack attack before 11 September. This begins a succession of revelations and questions over what signals and clues to the attacks political and intelligence officials missed.

Pentagon officials announce that they have taken custody in Afghanistan of a high-ranking paramilitary trainer for al-Qaeda. Ibn al-Shaykh al-Lilbi was handed over to US forces by Pakistani security officials.

Mullah Abdul Salem Zaeef, the Taleban ambassador to Pakistan, was also handed over to the US military by Pakistani security.

John Walker Lindh, the so-called American Taleban, arrives back in the US. He was discovered by Northern Alliance forces hiding in a flooded basement of a prison fortress near Mazar-e-Sharif. He was one of the few foreign Taleban fighters to survive a prisoner revolt at the fortress. He was later sentenced to 20 years in jail for joining the Taleban.

FBI director Robert Mueller announces that investigators believe the 11 September attacks were partly planned by al-Qaeda operatives in Malaysia. A retired Malaysian soldier, Yazid Sufaat, is alleged to have given $35,000 to Zacarias Moussaoui. Two hijackers aboard the plane that crashed into the Pentagon - Khalid al-Mihdhar and Nawaf al-Hazmi - visited Malaysia in January 2000 and stayed at Mr Yazid's flat outside Kuala Lumpur, Malaysian officials said later in February.