David Barkway, 34
David Barkway, 34, shown in this undated photo, is an executive with BMO Nesbitt Burns in Toronto, and was visiting a client on the 105th floor of the World Trade Center. He sent an electronic message to his colleagues in Toronto after the planes hit the towers, saying he was in trouble. (AP Photo/Hand Out, Toronto Star)
Juan Ceballos, 44
Chilean Juan Ceballos, 44, right, is shown in this undated family photo with his wife, Matilde Mejias. Ceballos, who has been missing since the attack on the World Trade Center in New York City, worked as mail distributor for a private company in the building. (AP Photo/Family handout via La Tercera)
Jim Cleere, 55, of Newton, Iowa
Jim Cleere, 55, of Newton, Iowa, an assistant vice president of telecommunications for Seabury & Smith in Des Moines, is shown in an undated photo. Cleere was reported missing following the terrorist attack Tuesday, Sept. 11, 2001, on the World Trade Center towers in New York, where he was scheduled to attend business meetings. (AP Photo/Newton Daily News)
Michael and his sister Christine Egan
Michael and his sister Christine Egan are shown in an undated photo. Christine, a 55-year-old Health Canada employee from Winnipeg, is believed to have been visiting her brother Michael in the World Trade Center during the terrorist attack on Tuesday Sept. 11, 2001. Michael Egan works for AON Insurance, which had offices on floors 92, 99 and 100 of two World Trade Center. Both are missing. (AP PHOTO/Hand Out, Winnipeg Sun)
Ralph Gerhardt
FILE--Ralph Gerhardt is shown in this undated family handout photo. The 34-year-old Vice President with Cantor Fitzgerald called his parents in Toronto just after the first plane hit the north tower of the World Trade Center in New York City, Tuesday, Sept.11, 2001. He has not been heard from since the line was suddenly cut off. (AP Photo/CFTO News via Toronto Star)
Jennifer Kane, 26
This is a 1997 family handout photo of Jennifer Kane, 26, a native of Plymouth, Mass., who according to her parents is missing and presumed dead, following the crash of American Airlines Flight 11, Tuesday, Sept. 11, 2001 into the north tower of the World Trade Center, where Kane worked on the 100th floor in the offices of Marsh and McLennan. (AP Photo/Family Handout)
John Keohane, Jersey City, N.J.
John Keohane, of Jersey City, N.J., is shown in this undated family handout photo. Keohane, 41, was a victim of the terrorist attacks in New York last week. After being evacuated from his office building near the World Trade Center, Keohane was killed a few blocks from the site when the buildings collapsed. (AP Photo/Family Photo)
This is an undated family handout photo of Joseph Mathai, 49, of Arlington, Mass., a technology executive and partner with Cambridge Technology Partners, was visiting the World Trade Center in New York on business, Tuesday, Sept. 11, 2001, and has been listed as missing since the terrorist attack and collapse of the towers. (AP Photo/Family Handout)
Michael Pelletier
Michael Pelletier is shown with his wife Sophie and their three-month-old son Nicolas and two-year-old daughter Sydney in an undated photo. Michael Pelletier is missing following the terrorist attack on the Tuesday, Sept. 11, World Trade Center in New York. He was working on the 105th floor of 1 World Trade Center at the time of the attack. (AP Photo/hanout, CP)
Scott Saber
A wall outside of a subway stop in New York has a flyer that contains information on a World Trade Center missing person, September 13, 2001. Rescue operations continue at The World Trade Center collapse site after a terrorist attack on the structure. REUTERS/Jeff Christensen