Khalid Sheikh Mohammed is a Pakistani national known for his role as a key planner of the September 11, 2001, terrorist attacks in the United States. He was born on March 1, 1965, in Kuwait and became involved in extremist activities in the late 1980s. Mohammed was captured in 2003 and has since been held at the Guantanamo Bay detention camp. He is often referred to as the "mastermind" behind the attacks, which resulted in the deaths of nearly 3,000 people. His trial has faced numerous delays and controversies, reflecting the complexities of military and legal proceedings related to terrorism and national security.