US President Joe Biden and US Vice President Kamala Harris participate in a Flight 93 wreath-laying ceremony on the 23rd anniversary of the September 11 terror attack in Shanksville, Pennsylvania, on September 11, 2024. AFP

US President Joe Boden takes part in a wreath -laying ceremony at the Flight 93 National Memorial in Shanksville, Pennsylvania, on September 11, 2024, on the 23rd anniversary of the 9/11 attacks. AFP

The Tribute in Light is illuminated on the skyline of lower Manhattan in New York City on the 23rd anniversary of the 9/11 attacks on the World Trade Center on September 11, 2024. AFP

People visit the 9/11 memorial as The Tribute in Light is illuminated on the skyline of lower Manhattan in New York City on the 23rd anniversary of the 9/11 attacks on the World Trade Center on September 11, 2024. AFP

TOPSHOT - (L-R) 21st chairman of the Joint Chiefs of Staff Charles Quinton Brown Jr., US Vice President Kamala Harris and US President Joe Biden participate in a wreath laying ceremony on the 23rd anniversary of the September 11 terror attack at the Pentagon in Arlington, Virginia on September 11, 2024. AFP

US President Joe Biden and US Vice President Kamala Harris participate in a wreath laying ceremony on the 23rd anniversary of the September 11 terror attack at the Pentagon in Arlington, Virginia on September 11, 2024. AFP

NEW YORK, NEW YORK - SEPTEMBER 11: Decorations are left behind on the panel of names at the 9/11 memorial site on September 11, 2024 in New York City. Family, friends, first responders and dignitaries are at Ground Zero honoring the lives of those lost on the 23rd anniversary of the terror attacks of September 11, 2001, at the World Trade Center. Memorials are also being held at the Pentagon in Arlington, VA and at the Flight 93 National Memorial in Shanksville, PA. AFP

US Vice President and Democratic presidential candidate Kamala Harris and US President Joe Biden take part in a wreath-laying ceremony at the Pentagon in Washington, DC, on September 11, 2024, on the 23rd anniversary of the 9/11 attacks. AFP

The Tribute in Light is illuminated on the skyline of lower Manhattan in New York City on the 23rd anniversary of the 9/11 attacks on the World Trade Center on September 11, 2024, behind the flag plaza at Liberty State Park in Jersey City, New Jersey. AFP

TOPSHOT - People look at the names of victims on the South Tower Memorial Pool during during the 23rd anniversary of the September 11 terror attack on the World Trade Center at Ground Zero, in New York City on September 11, 2024. AFP

The Tribute in Light is illuminated on the skyline of lower Manhattan in New York City on the 23rd anniversary of the 9/11 attacks on the World Trade Center on September 11, 2024, as seen from Jersey City, New Jersey. AFP