9/11 အကြမ်းဖက်တိုက်ခိုက်ခံရမှု နှစ်ပတ်လည်ကျင်းပ

Roses are placed on names on the memorial during the ceremony marking the 15th anniversary of the attacks on the World Trade Center at The National September 11 Memorial and Museum in Lower Manhattan in New York City, Sept. 11, 2016.

President Barack Obama places a wreath during a ceremony marking the 15th anniversary of the 9/11 attacks at the Pentagon in Washington, Sept. 11, 2016.

People watch as President Barack Obama, Defense Secretary Ash Carter and Joint Chiefs Chair Gen. Joseph Dunford take part in a ceremony marking the 15th anniversary of the 9/11 attacks at the Pentagon in Washington, Sept. 11, 2016.

An FDNY firefighter stands as part of an honor guard at the FDNY Memorial Wall near the World Trade Center, Sept. 11, 2016, on the 15th anniversary of the attacks on the World Trade Center in New York.

A mourner holds a photo of her loved one during the 15th anniversary of the attacks of the World Trade Center at the National September 11 Memorial in New York, Sept. 11, 2016.

A firefighter touches the names of the firefighters, who died in the attacks carved in the south pool, during 15th anniversary ceremony of the attacks of the World Trade Center at the National September 11 Memorial in New York, Sept. 11, 2016.

A woman becomes emotional during a moment of silence in a ceremony for the 15th anniversary of the attacks of the World Trade Center at the National September 11 Memorial, in New York, Sept. 11, 2016.

A hand written note from the British Prime Minister Theresa May rests on a bouquet of roses paying respects to the victims of the attacks of the World Trade Center in New York, on the 15th anniversary of the attacks, at the memorial to the British victims of the attacks in Grosvenor Square gardens near the United States Embassy in London, Sept. 11, 2016.

A mourner places a flag in the Empty Sky memorial on the morning of the 15th anniversary of the 9/11 attacks in New Jersey, Sept. 11, 2016.

Candles in memory of the passengers and crew of Flight 93, are lit along the Wall of Names at the Flight 93 National Memorial in Shanksville, Pa., Sept. 10, 2016, as the nation marks the 15th anniversary of the Sept. 11 attacks.

The Tribute in Light rises above the lower Manhattan skyline, Sept. 10, 2016, in New York to mark the fifteenth anniversary of the terrorist attacks of Sept. 11, 2001 on the United States.