Plan to Preserve Sept. 11 Remains Leaves Open Future Identification.

Reports that the remains of more than a thousand people who died in the September 11, 2001 attack on New York City's World Trade Center will be preserved in a memorial space built at ground zero, in the hope that science will advance to the point that they can be identified. Challenge of accommodating relatives of people killed in the attack, who have asked that unidentified remains be interred at the site; Approach used by the medical examiner's office to preserve the remains; Efforts by the medical examiner's office to match the remains with people listed as missing; Role of DNA; Comments of Shiya Ribowsky, deputy director of investigation; Details of the memorial.