F.B.I. agents have interviewed a Saudi citizen identified by Congressional investigators as a likely intelligence operative for Riyadh who befriended two of the 9/11 hijackers in California more than a year before the attacks, government officials said today. The interview today in Saudi Arabia was the first of two scheduled sessions between investigators and the Saudi, Omar al-Bayoumi, who was living as a student in San Diego in early 2000 when he met Khalid al-Mihdhar and Nawaf al-Hazmi, 2 of the 15 Saudis who came to the United States to train for the hijackings. Full Story