Ariel Dorfman, New York Times
Of the 2,753 victims of the terrorist attack on the World Trade Center on Sept. 11, 2001, no physical trace has been found for 1,112 of them. Thus, for 40 percent of those who died that day, no remains have been returned to their families. In the aftermath of the carnage, some people exhibited photos, family snapshots, of those who had vanished and remained unaccounted for, despite the efforts of the authorities.
Source: Real Clear Politics