Abdul Quddoos Khan

Abdul Quddoos Khan (Urdu: عبدالقدوس خان) is a Pakistani microbiologist. Khalid Sheikh Mohammed, widely considered one of the masterminds of the September 11, 2001 al Qaeda attacks in the United States, was captured in Khan's home on March 1, 2003.

According to an article published in the Washington Post on March 23, 2003 unnamed officials believe "handwritten documents and computer hard drives" found in Khan's home suggest that al Qaeda had a program to develop biological weapons. The Washington Post reported that Khan had "disappeared".