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9/11 Mastermind Trial Set for 2028: What to Know

A U.S. military judge has scheduled a June 2028 trial date for Khalid Sheikh Mohammed and three other men accused of plotting the September 11, 2001, attacks, marking a significant development in one of the longest-running terrorism prosecutions in American history.

Key Facts

FactDetail
Scheduled Trial DateJune 5, 2028
DefendantsKhalid Sheikh Mohammed, Walid bin Attash, Ali Abdul Aziz Ali, Mustafa al-Hawsawi
VenueMilitary commission at Guantánamo Bay, Cuba
JudgeAir Force Lt. Col. Michael A. Schrama
StatusAll defendants have pleaded not guilty
Prosecutors’ RequestJanuary 2027 trial date (rejected by judge)

Who Is Khalid Sheikh Mohammed?

Khalid Sheikh Mohammed, widely known as KSM, is the alleged mastermind of the September 11 attacks. U.S. prosecutors accuse him of developing the plot to use hijacked commercial aircraft as weapons against American targets and working with al-Qaeda leader Osama bin Laden to execute the plan.

He was captured in Rawalpindi, Pakistan, on March 1, 2003, and was held in CIA secret detention facilities for approximately three and a half years. During that time, declassified investigations confirm he was subjected to the agency’s “enhanced interrogation” program, including waterboarding and sleep deprivation. These interrogation practices have become central to the legal battle over whether statements made by Mohammed and other defendants can be used at trial.

In September 2006, Mohammed was transferred to the U.S. military base at Guantánamo Bay, Cuba, where he has remained since.

The 2028 Trial Date | 9/11 Mastermind Trial Set for 2028

On August 26, 2026, Air Force Lt. Col. Michael A. Schrama issued a ruling scheduling the trial to begin on June 5, 2028. The judge rejected prosecutors’ request for a January 2027 start date, determining that additional time was needed to resolve outstanding pretrial disputes.

These disputes include disagreements over what evidence can be presented, classified information issues, and legal challenges surrounding statements obtained during CIA detention. The scheduling order establishes a series of deadlines and milestones leading up to the 2028 trial date.

Under the current schedule, jury selection will begin June 5, 2028, with opening statements scheduled to begin 30 days after the members are empaneled.

Who Are the Other Defendants?

Mohammed faces trial alongside three alleged accomplices:

DefendantAlleged Role
Walid bin AttashAlleged co-conspirator in the 9/11 plot
Ali Abdul Aziz AliAlleged co-conspirator
Mustafa al-HawsawiAlleged financial facilitator and co-conspirator

All four defendants have pleaded not guilty.

Why Has the 9/11 Trial Taken So Long?

The case has been pending for more than two decades, affected by numerous legal and procedural obstacles:

  • Interrogation and evidence disputes: Allegations that CIA interrogation methods contaminated defendants’ statements have led to extensive litigation over what evidence can be used at trial.
  • Military commission system: The case has moved between federal court and military commission systems, with jurisdictional disputes causing significant delays.
  • Plea agreement controversy: In 2024, plea deals negotiated with prosecutors would have allowed Mohammed and two co-defendants to plead guilty in exchange for life sentences. However, then-Defense Secretary Lloyd Austin revoked the agreements, restoring the possibility of the death penalty. In July 2025, a federal appeals court threw out the plea agreements.
  • Previous canceled trial dates: A trial was previously scheduled for 2021 but was later canceled.

What Happens Next?

The 2028 trial date is contingent on the case meeting a series of deadlines and milestones in the coming years. Judge Schrama has stated that, absent good cause, the commission will not grant extensions or continuances involving key procedural steps.

The Supreme Court is also considering whether to review the appellate court’s decision regarding the plea agreements. This ongoing litigation could further affect the timeline.

Historical Context: The 9/11 Attacks

On September 11, 2001, four commercial airliners were hijacked by al-Qaeda operatives:

  • Two planes crashed into the World Trade Center in New York City
  • One plane struck the Pentagon in Washington, D.C.
  • One plane crashed into a field in Pennsylvania after passengers fought back

Nearly 3,000 people died in the attacks, making it the deadliest terrorist attack on U.S. soil.

Timeline

Year/DateEvent
September 11, 20019/11 attacks kill nearly 3,000 people
March 1, 2003Khalid Sheikh Mohammed captured in Pakistan
2003–2006Held in CIA secret detention facilities
September 2006Transferred to Guantánamo Bay
2008Formal charges filed against Mohammed and co-defendants
May 2012Arraignment at Guantánamo
2024Defense Secretary revokes plea agreements
July 2025Federal appeals court throws out plea deals
August 26, 2026Judge Schrama sets June 5, 2028 trial date

Frequently Asked Questions

1. When is the 9/11 mastermind trial scheduled?
The trial is scheduled to begin on June 5, 2028, before a military commission at Guantánamo Bay, Cuba.

2. Who is Khalid Sheikh Mohammed?
He is the alleged mastermind of the September 11, 2001, attacks. U.S. prosecutors accuse him of developing and directing the plot to crash hijacked airliners into U.S. targets.

3. Has Khalid Sheikh Mohammed been convicted?
No. He and the other defendants have pleaded not guilty and have not been convicted of the 9/11 charges.

4. Why has the trial been delayed for so many years?
Delays have resulted from pretrial litigation, disputes over evidence obtained during CIA interrogation, changes in legal strategy, jurisdictional issues, and most recently, the revocation of plea agreements.

5. Who are the other defendants?
The other defendants are Walid bin Attash, Ali Abdul Aziz Ali, and Mustafa al-Hawsawi. They are accused as alleged co-conspirators in the 9/11 plot.

6. Will the trial definitely happen on June 5, 2028?
Not necessarily. The date is contingent on the case meeting deadlines and milestones. Additional legal proceedings or ongoing Supreme Court review of the plea agreement decision could cause further delays.

7. Where will the trial take place?
The trial will be held before a military commission at the U.S. naval base at Guantánamo Bay, Cuba.

8. What charges do the defendants face?
They face charges related to their alleged roles in planning and executing the September 11 attacks, including conspiracy and terrorism-related offenses.

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