Sufaat is now believed to be one of al-Qaeda's main anthrax researchers. In 1993 Sufaat set up a pathology laboratory called Green Laboratory Medicine, at which he subsequently tried to weaponise anthrax on behalf of al-Qaeda. From 5 to 8 January 2000, a major meeting of al-Qaeda and JI personnel was held in Kuala Lumpur (see 2000 Kuala Lumpur al-Qaeda Summit); four of those who attended stayed with Sufaat at his home. He is also suspected of providing employment documents to Zacarias Moussaoui, and providing lodging for two of the 11 September hijackers, namely Khalid al-Midhar and Nawaf al-Hazmi.