World Trade Center

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** FILE ** Hands stretch towards what has become known as the Ground Zero Cross at the World Trade Center site in New York, Oct. 3, 2002. (Associated Press)

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New York City Health Commissioner Dr. Thomas Farley says it’s “too early” to be conclusive about links between the World Trade Center bombing and certain diseases, but high interest led to the release of what data is available so far. (Associated Press)

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Ava Kathleen Schmoelzer, 7, from Stamford, Conn., places flowers for her aunt on the wall overlooking the South Tower reflecting pool on the 11th anniversary of the Sept. 11 terrorist attacks on the World Trade Center 2. (AP Photo/Timothy A. Clary, Pool)

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Shannon and Lauren Gullickson scratch the name of their uncle, Firefighter Joe Gullickson, on paper as friends and relatives of the victims of the Sept. 11 terrorist attacks on the World Trade Center attend a ceremony marking the 11th anniversary of the attacks at the National Sept. 11 Memorial at the World Trade Center site. (AP Photo/The Daily News, Todd Maisel, Pool)

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** FILE ** Family members view the names of their relatives etched into the 9/11 Memorial during the commemoration of the 11th anniversary of the terrorist attacks on the World Trade Center. (AP Photo/John Moore, Pool)

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People walk pass a sign in front of Trinity Boxing Club with the construction site of Four World Trade Center at their backs during the 11th anniversary of the Sept. 11 terrorist attacks. (AP Photo/Julio Cortez)

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Geraldine Shaw of East Windsor, N.J. looks at the name of her son Jeffrey on a panel of the north pool during a ceremony marking the 11th anniversary of the Sept. 11 terrorist attacks at the National Sept. 11 Memorial at the World Trade Center site. (AP Photo/The Record of Bergen County, Chris Pedota, Pool)

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Judy Parisio (right) looks up as she and Linda Malbrba (left) make a copy of the engraved name of their niece, Frances Ann Cilente, who worked and died at the World Trade Center, as the giant flag came down at One World Trade Center during the commemoration ceremony of the 11th anniversary of 9/11. (AP Photo/The New York Times, Chang W. Lee, Pool)

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** FILE ** Carrie Bergonia remembers her fiance, firefighter Joseph Ogren, who was killed in the terrorist attacks of Sept. 11, 2001, during a ceremony marking the 11th anniversary of the attacks at the National Sept. 11 Memorial at the World Trade Center site. (AP Photo/The Daily News, Todd Maisel, Pool)

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A message is written on a United States flag at the construction site of One World Trade Center in the background during the 11th anniversary of the Sept. 11 terrorist attacks. (Associated Press)

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Tania Garcia of Florida, who lost her sister Marlyn Garcia during the Sept. 11 terrorist attacks, comforts Cathy Pepe of Yorktown Heights, N.Y., who lost her husband, Salvatore, during the attacks, during a ceremony marking the 11th anniversary of 9/11 at the National Sept. 11 Memorial at the World Trade Center site in New York. (AP Photo/The Record of Bergen County, Chris Pedota, Pool)

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Police officers of the Port Authority of New York and New Jersey carry an American flag that flew over at the World Trade Center towers on Sept. 11, 2012, during a ceremony for the 11th anniversary of 9/11 at the site of the World Trade Center in New York. (Associated Press)