The appearance of Khalid Sheik Mohammed and four other men in a military courtroom at Guantanamo Bay, Cuba, ends a nearly decade-long back and forth over how best to try the men the U.S. says helped plan, pay for and execute the Sept. 11 attacks.
Khalid Sheikh Mohammed — or KSM, as he is known — has claimed that he was the mastermind of the attacks "from A to Z." But his ties to terrorism, by his own admission, go beyond that one plot. KSM saw himself as the sun around which his network revolved.
Khalid Sheikh Mohammed and four other men charged in the Sept. 11 attacks were supposed to be tried six years ago in a military tribunal created by the Bush administration.
But that system — which allowed hearsay evidence, among other things — faced questions about its fundamental fairness. When President Obama came into office, he put all the proceedings at Guantanamo on hold and asked that the commission system be revamped.
Since then, there has been an effort to make sure the trials at Guantanamo are credible, with both Congress and the Supreme Court weighing in.
The man who claims to have orchestrated the Sept. 11 attacks is expected to appear in a military courtroom this Saturday. Khalid Sheikh Mohammed and four other men are supposed to answer formal charges related to their roles in the plot.
Their arraignment will be at Guantanamo Bay, and it is the first step that leads — possibly years from now — to a military trial.
Documents found at Osama bin Laden's compound in Pakistan reveal an al-Qaida leader who had come to feel marginalized and frustrated with actions taken by affiliated terror groups he had helped inspire.
The man responsible for the 9/11 terror attacks is seen struggling to limit attacks that killed mostly Muslims, and to keep the international jihad movement focused on what he viewed as the main target: the United States.