A boy walks among some of the 3,000 flags placed in memory of the lives lost in the September 11, 2001 attacks, at a park in Winnetka, Illinois, September 10, 2015. (Photo by Jim Young/Reuters)





A U.S. flag is draped on the side of the Pentagon, Friday, September 11, 2015, where the building was attacked on September 11th in 2001, on the 14th anniversary of the attack. (Photo by Jacquelyn Martin/AP Photo)





People take photos as they travel on the Staten Island Ferry into lower Manhattan toward the Tribute in Light in New York September 10, 2015. (Photo by Carlo Allegri/Reuters)





A member of the New York Fire Department salutes at the Wall of Remembrance, a memorial for fire fighters killed in the 9/11 attacks on the side of Engine 10, on the morning marking the 14th anniversary of the attacks, in New York September 11, 2015. Relatives of the nearly 3,000 people killed in the Sept. 11, 2001, attacks are due to gather in New York, Pennsylvania and outside Washington on Friday to mark the 14th anniversary of the hijacked airliner strikes carried out by al Qaeda militants. (Photo by Andrew Kelly/Reuters)





One World Trade Center is seen behind U.S flags on the morning of the 14th anniversary of the 9/11 attacks, in Lower Manhattan in New York September 11, 2015. (Photo by Andrew Kelly/Reuters)





A boy places his hand on a man's shoulder during a ceremony marking the 14th anniversary of the 9/11 attacks, at the National September 11 Memorial and Museum in Lower Manhattan in New York September 11, 2015. (Photo by Andrew Kelly/Reuters)





A child lays on the memorial during a ceremony marking the 14th anniversary of the attacks on the World Trade Center at The National September 11 Memorial and Museum in Lower Manhattan in New York, September 11, 2015. (Photo by Andrew Kelly/Reuters)





A man stands with a U.S. flag during a ceremony marking the 14th anniversary of the attacks on the World Trade Center at The National September 11 Memorial and Museum in Lower Manhattan in New York, September 11, 2015. (Photo by Andrew Kelly/Reuters)





The annual Tribute in Light is tested in New York's Lower Manhattan as a woman walks next to the 9/11 Memorial in Exchange Place, New Jersey, September 10, 2015. (Photo by Eduardo Munoz/Reuters)





A New Jersey Police Officer takes pictures at sunrise across from New York's Lower Manhattan and One World Trade Center, in Liberty State Park in Jersey City, New Jersey, September 11, 2015. (Photo by Eduardo Munoz/Reuters)





Souvenirs for 9/11 victims are seen in a memorial across from New York's Lower Manhattan and One World Trade Center in Exchange Place, New Jersey September 11, 2015. (Photo by Eduardo Munoz/Reuters)





The annual Tribute in Light is tested in New York's Lower Manhattan as the 9/11 Memorial is seen in Exchange Place, New Jersey, September 10, 2015. New York will mark the 14th anniversary of the 9/11 attack on the World Trade Center on Friday. REUTERS/Eduardo Munoz





A Jersey City Fire Department boat throws water with the colors red, blue, and white along the Hudson river while a New Jersey police officer stands guard during a ceremony for 9/11 victims at a memorial, across from New York's Lower Manhattan and One World Trade Center in Exchange Place, New Jersey September 11, 2015. (Photo by Eduardo Munoz/Reuters)





Jersey City Fire Department members attend a ceremony for 9/11 victims at a memorial across from New York's Lower Manhattan and One World Trade Center in Exchange Place, New Jersey September 11, 2015. (Photo by Eduardo Munoz/Reuters)





People are reflected in the windows at One World Observatory, the observation deck at One World Trade Center, as the Tribute in Light installation shines in Lower Manhattan in New York, September 11, 2015. People visited the recently opened viewing destination on Friday, which marked the 14th anniversary of the 9/11 attacks. The Tribute in Light is an annually lit feature commemorating the attacks. (Photo by Andrew Kelly/Reuters)





People peer through the windows at One World Observatory, the observation deck at One World Trade Center, as the Tribute in Light installation shines in Lower Manhattan in New York, September 11, 2015. (Photo by Andrew Kelly/Reuters)





People peer through the windows at One World Observatory, the observation deck at One World Trade Center, as the Tribute in Light installation shines in Lower Manhattan in New York September 11, 2015. (Photo by Andrew Kelly/Reuters)





People gather at One World Observatory, the observation deck at One World Trade Center, in Lower Manhattan in New York September 11, 2015. (Photo by Andrew Kelly/Reuters)





The Tribute in Light installation is seen from One World Observatory, the observation deck at One World Trade Center, in Lower Manhattan in New York September 11, 2015. (Photo by Andrew Kelly/Reuters)





People photograph the sunset from One World Observatory, the observation deck at One World Trade Center, in Lower Manhattan, New York, September 11, 2015. (Photo by Andrew Kelly/Reuters)





The Tribute in Light is seen on the 14th anniversary of the 9/11 attacks on the World Trade Center at the National September 11 Memorial and Museum in Lower Manhattan in New York September 11, 2015. (Photo by Andrew Kelly/Reuters)





The Tribute in Light illuminates the Lower Manhattan sky as the 7 Subway train rumbles toward the Billie Jean King Tennis Center on the 14th anniversary of the 9/11 attacks in New York September 11, 2015. (Photo by Carlo Allegri/Reuters)





A plane preparing to land at LaGuardia is pictured between the Empire State building, lit in traditional red, white and blue to commemorate 9/11, and the Chrysler building in New York September 11, 2015. (Photo by Carlo Allegri/Reuters)





The Tribute in Light illuminates the Lower Manhattan sky as a plane prepares to land at LaGuardia on the 14th anniversary of the 9/11 attacks in New York September 11, 2015. (Photo by Carlo Allegri/Reuters)





The Tribute in Light is illuminated next to the Statue of Liberty (C) and One World Trade Center (L) during events marking the 14th anniversary of the 9/11 attacks on the World Trade Center in New York September 11, 2015. (Photo by Eduardo Munoz/Reuters)





People take pictures of the Tribute in Light while it is illuminated next to the Statue of Liberty (C), One World Trade Center and the Empire State Building during events marking the 14th anniversary of the 9/11 attacks on the World Trade Center in New York September 11, 2015. (Photo by Eduardo Munoz/Reuters)





People take pictures of the Tribute in Light as it is illuminated next to the One World Trade Center during events marking the 14th anniversary of the 9/11 attacks on the World Trade Center in New York September 11, 2015. (Photo by Eduardo Munoz/Reuters)





The Tribute in Light is illuminated next to the One World Trade Center while people enjoy the view along the Hudson River during events marking the 14th anniversary of the 9/11 attacks on the World Trade Center in New York September 11, 2015. (Photo by Eduardo Munoz/Reuters)





The Tribute in Light is illuminated during events marking the 14th anniversary of the 9/11 attacks on the World Trade Center in New York September 11, 2015. (Photo by Eduardo Munoz/Reuters)