The United States is marking the 25th anniversary of the 11 September 2001 terrorist attacks with ceremonies at the three attack sites: the National September 11 Memorial in New York, the Pentagon in Virginia, and the Flight 93 National Memorial in Pennsylvania. The commemorations honour the nearly 3,000 people killed when 19 al-Qaeda hijackers seized four commercial aircraft, and feature reflections from officials and survivors who lived through the attacks and lost colleagues or relatives that day.

President Donald Trump is expected to attend the Pentagon ceremony, while New York's events will be attended by Governor Kathy Hochul and Mayor Zohran Mamdani, alongside former presidents George W. Bush, Bill Clinton, Barack Obama and Joe Biden. Those interviewed included retired Major General Bert Mizusawa, a former senior Pentagon official who witnessed the attack's aftermath and later hired the most senior military officer killed there, Lieutenant General Timothy Maude; Senator Mark Warner, who recalled watching smoke rise above the Pentagon; and Nassau County Executive Bruce Blakeman, whose nephew, a New York court officer, died assisting a victim when the World Trade Center's second tower collapsed.