911 Towers

A Saudi Imam, 2 Hijackers and Lingering 9/11 Mystery

WASHINGTON — Inside an opulent palace in Riyadh late one evening in February 2004, two American investigators interrogated a man they believed might hold answers to one of the lingering mysteries of the Sept. 11, 2001, attacks: What role, if any, did officials in Saudi Arabia’s government play in the plot?

The man under questioning, Fahad al-Thumairy, had been a Saudi consular official based in Los Angeles and the imam of a mosque visited by two of the hijackers. The investigators, staff members of the national 9/11 commission who had waited all day at the United States Embassy before being summoned to the late-night interview, believed that tying him to the plot could be a step toward proving Saudi government complicity in the attacks.