The last victim was identified in March 2015.
The remains of a man killed in the 9/11 terror attack on New York's World Trade Centre have been identified 16 years on following advances in DNA testing.
The man's identity was confirmed through DNA retesting. He is the 1,641 victim of the 2,753 killed at the lower Manhattan site that day to be identified; 40 percent of those killed have not had their remains identified.More news: Amanda Knox pens opinion piece in support of Michelle Carter
More than 1,100 of them have either not been identified, or were never found.
Medical examiners have recently been using a process that involves pulverising the fragments to extract DNA, and comparing it to a collection of genetic material collected from victims and their relatives.
Forensic experts have said over the years that more identifications are expected as DNA technology evolves, although the pace has been slow.More news: 19 countries officially apply to host the EMA; 8 chase EBA
As DNA testing advanced, so has the multimillion-dollar effort to connect more than 21,900 bits of remains to individual victims. Conceivable stays of more than 20 casualties were recuperated.
Now and again, researchers have backpedaled to a similar bone section at least 10 times, trusting new innovation will give answers.
Two planes crashed in New York City that day, plus one at the Pentagon in Virginia and another in Pennsylvania, claiming almost 3,000 lives and injuring thousands more.More news: Taylor Swift To Testify Against Former Denver DJ In Groping Case