The United States is marking the 15th anniversary of the September 11th terrorist attacks, when al-Qaida terrorists hijacked four planes and flew them into the World Trade Center in New York and the Pentagon near Washington, while one crashed in rural Pennsylvania.
US Marks 15th Anniversary of 9/11 Attacks

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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.

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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.

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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.

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Pan Ei Mon, who is married to jailed Reuters reporter Wa Lone, is seen with their daughter after attending a hearing at Myanmar's Supreme Court in Naypyitaw, Myanmar.