World Trade Center

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The 9/11 attack on the World Trade Center (Associated Press photo)

THIRD OF A SERIES OF FOUR PICTURES---Smoke billows from one of the towers of the World Trade Center and flames and debris explode from the second tower, Tuesday, Sept. 11, 2001. In one of the most horrifying attacks ever against the United States, terrorists crashed two airliners into the World Trade Center in a deadly series of blows that brought down the twin 110-story towers. (AP Photo/Chao Soi Cheong)

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FILE - In this Wednesday, Sept. 12, 2001 file photo, New York City Mayor Rudolph Giuliani, center, leads New York Gov. George Pataki, left, and Sen. Hillary Clinton, D-N.Y., on a tour of the site of the World Trade Center disaster. While stumping for Donald Trump in Ocala, Fla., on Oct. 12, 2016, former New York City Mayor Rudy Giuliani accused Hillary Clinton of falsely claiming to have been in New York on Sept. 11, 2001. It isn’t clear what Giuliani was talking about. On many occasions, Clinton has described being in Washington, where Congress was in session, on Sept. 11 when hijacked jets began striking the World Trade Center and the Pentagon. Flights were still grounded on Sept. 12, 2001, but Clinton traveled to New York City the next day aboard a federal plane. There, she circled the smoldering World Trade Center in a helicopter, then toured ground zero with Giuliani and Pataki. (AP Photo/Robert F. Bukaty, File)

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World Trade Center towers overlooking Freedom Tower - Photo: Robert Carley

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Ahmed Mohammed, a New York City hot dog vendor caught on camera selling $30 hot dogs outside the World Trade Center, could reportedly face up to $1,500 in fines after police handed him three summonses on Wednesday. (Twitter/@NYPD1Pct)

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A rescue plan is in place to save two window washers stuck on broken scaffolding at the new World Trade Center in new York City. (Twitter/@Zackfoot)

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Firefighters rest as rescue efforts continue at the World Trade Center in New York Wednesday Sept. 12, 2001. (Associated Press)

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In this Sept. 11, 2001, file photo, people run from a collapsing World Trade Center tower in New York. (AP Photo/Suzanne Plunkett, File)

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In this Sept. 11, 2001 file photo, United Airlines Flight 175 collides into the south tower of the World Trade Center in New York as smoke billows from the north tower. (AP Photo/Chao Soi Cheong)

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Joe Daniels, 9/11 Memorial president (right), and Anthoula Katsimatides, a member of the 9/11 Memorial board, approach a steel crossbeam recovered from the World Trade Center site and installed at the 9/11 Memorial Museum in New York. This 17-foot-tall intersecting steel column and crossbeam was found in the rubble of 6 World Trade Center on September 13, 2001. It has since been perceived as a religious symbol by many, receiving an official ceremonial blessing of the cross. (Associated Press)

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Visitors at the pools of the National 9/11 Memorial Museum, near the former site of the World Trade Center Associated Press photo

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Part of the tower (left) that previously broadcast radio and television signals from the World Trade Center is displayed as part of an exhibit about coverage of the Sept. 11, 2001 attacks, at the Newseum. The The goal of the Newseum (top) is to educate visitors on the First Amendment. Visitors (above) crowd outside the building to read a display of newspaper front pages. The Newseum showcases a selection of more than 800 front pages from newspapers across the country and around the world. (Associated Press Photographs)

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An American flag that was flown over the World Trade Center ruins after 9/11 and was stolen last week from the front porch of the family of a fallen firefighter has been returned with an apology note. (NBC 4 Washington)

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An American flag that was flown over the World Trade Center ruins after 9/11 and stolen last week from the front porch of the family of a fallen firefighter has been returned with an apology note. (NBC 4 Washington)