Khalid Sheikh Mohammed, who is believed to have planned the September 11, 2001, terrorist attacks on the United States, has been held by U.S. authorities since 2003. He was captured in Pakistan and transferred to a U.S. military prison in Guantánamo Bay, Cuba, where he has remained in custody for over two decades. Mohammed is considered one of the most significant figures in the al-Qaeda network, and his capture was a major milestone in the U.S. response to the 9/11 attacks. During his time in custody, Mohammed has been subjected to various legal and interrogation procedures. He was held without trial for many years under the U.S. government's controversial "enemy combatant" designation, which allowed for indefinite detention without charges. In 2008, he was charged with conspiracy to commit the 9/11 attacks and other terrorism-related offenses. His case has drawn significant attention due to the legal and ethical questions surrounding the treatment of detainees at Guantánamo Bay. Mohammed has consistently denied planning the 9/11 attacks, and his legal team has challenged the legitimacy of the charges against him. His case has been a focal point in debates about the balance between national security and individual rights, as well as the legal framework governing the detention of terrorism suspects. The U.S. government has argued that his prosecution is necessary to hold those responsible for the 9/11 attacks accountable. Despite ongoing legal proceedings, Mohammed's trial has faced delays and legal challenges. He has been held in a high-security facility at Guantánamo Bay, and his legal status remains a subject of public and legal scrutiny. His case continues to be a symbol of the complex and often contentious nature of counterterrorism efforts and the rights of those detained in the aftermath of global conflicts.