Law enforcement officers gather at the National Law Enforcement Officers Memorial to mark the 16th anniversary of the Sept. 11, 2001 terror attacks in Washington D.C., the United States, on Sept. 11, 2017. (Xinhua/Yang Chenglin)

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Law enforcement officers mourn the victims of the 9/11 terror attacks after they laid a wreath at the National Law Enforcement Officers Memorial to mark the 16th anniversary of the Sept. 11, 2001 terror attacks in the United States, in Washington D.C., the United States, on Sept. 11, 2017. (Xinhua/Yang Chenglin)

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Law enforcement officers mourn the victims of the 9/11 terror attacks at the National Law Enforcement Officers Memorial to mark the 16th anniversary of the Sept. 11, 2001 terror attacks in the United States, in Washington D.C., the United States, on Sept. 11, 2017. (Xinhua/Yang Chenglin)

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Civilians and law enforcement officers gather at the National Law Enforcement Officers Memorial to mark the 16th anniversary of the Sept. 11, 2001 terror attacks in the United States, in Washington D.C., the United States, on Sept. 11, 2017. (Xinhua/Yang Chenglin)

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Law enforcement officers gather at the National Law Enforcement Officers Memorial to mark the 16th anniversary of the Sept. 11, 2001 terror attacks in the United States, in Washington D.C., the United States, on Sept. 11, 2017. (Xinhua/Yang Chenglin)

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Craig W. Floyd, President and CEO of the National Law Enforcement Officers Memorial Fund, makes remarks to mark the 16th anniversary of the Sept. 11, 2001 terror attacks in the United States, in Washington D.C., the United States, on Sept. 11, 2017. (Xinhua/Yang Chenglin)

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