World Trade Center

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A flag-draped casket is lifted out of a police vehicle during the ceremonial transfer of unidentified remains of those killed at the World Trade Center from the Office of the Chief Medical Examiner to the World Trade Center site, Saturday, May 10, 2014, in New York. The remains will be transferred to an underground repository in the same building as the National September 11 Memorial Museum. (AP Photo/Jason DeCrow)

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In this Tuesday, May 6, 2014 photo, the entrance to the National September 11 Memorial Museum, center, is located between the two reflecting pools at the World Trade Center in New York. The unidentified remains of those killed at the World Trade Center on Sept. 11, 2001 are set to be moved Saturday, May 10, 2014 to a repository located at bedrock level in the same building as the museum. (AP Photo/Mark Lennihan)

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This Tuesday, May 6, 2014 photo shows the entrance to the National September 11 Memorial Museum, left, at the World Trade Center in New York. The unidentified remains of those killed at the World Trade Center on Sept. 11, 2001 are set to be moved Saturday, May 10, 2014 to a repository in the same building as the museum. The unfinished transportation hub, top left, 3 World Trade Center, right, under construction, and one of the two reflecting pools, bottom, surround the museum. (AP Photo/Mark Lennihan)

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In this Tuesday, May 6, 2014 photo, the wedge-shaped pavilion entrance to the National September 11 Museum, center, is located at the World Trade Center in New York. The unidentified remains of those killed at the World Trade Center on Sept. 11, 2001 are set to be moved Saturday, May 10, 2014 to a repository located at bedrock level in the same building as the museum. (AP Photo/Mark Lennihan)

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In this Tuesday, May 6, 2014 photo, the entrance to the National September 11 Memorial Museum, left, is located at the World Trade Center in New York. The unidentified remains of those killed at the World Trade Center on Sept. 11, 2001 are set to be moved Saturday, May 10, 2014 to a repository located at bedrock level in the same building as the museum. The unfinished transportation hub, top left, 3 World Trade Center, right, under construction, and one of the two reflecting pools, bottom, surround the museum. (AP Photo/Mark Lennihan)

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In this Tuesday, May 6, 2014 photo, One World Trade Center towers over the lower Manhattan skyline in New York. The unidentified remains of those killed at the World Trade Center on Sept. 11, 2001 are set to be moved Saturday, May 10, 2014 to a repository at bedrock level below the National September 11 Memorial & Museum, located at the base of the tower. (AP Photo/Mark Lennihan)

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A flower has been placed next to the name of a victim of the September 11, 2001 attacks that has been engraved at the National September 11 Memorial & Museum, Thursday, May 8, 2014 at the World Trade Center in New York. The unidentified remains of those killed in the attacks of Sept. 11, 2001 are set to be moved Saturday to a repository beneath the memorial. (AP Photo/Mark Lennihan)

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Visitors to the National September 11 Memorial & Museum peer through the windows of the museum, Thursday, May 8, 2014 at the World Trade Center in New York. The unidentified remains of those killed in the attacks of Sept. 11, 2001 are set to be moved Saturday to a repository beneath the memorial and museum. (AP Photo/Mark Lennihan)