Mourners hold photos of their loved ones during the 15th anniversary of the attacks of the World Trade Center at the Sept. 11 memorial on Sunday in New York. Associated Press/Mary Altaffer
Visitors make their way through the Flight 93 National Memorial before lit candles are carried to the Wall of Names in memory of the passengers and crew at the Flight 93 National Memorial in Shanksville, Pa., on Saturday.Associated Press/Jared Wickerham
Republican presidential candidate Donald Trump, left, speaks with New Jersey Gov. Chris Christie, right, as they attend a ceremony at the Sept. 11 memorial in New York on Sunday. Associated Press/Andrew Harnik
Democratic presidential candidate Hillary Clinton, center, accompanied by Sen. Chuck Schumer, D-N.Y., center left, Rep. Joseph Crowley, D-N.Y., second from left, and New York Mayor Bill de Blasio, center top, attends a ceremony at the Sept. 11 memorial on Sunday. Associated Press/Andrew Harnik
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