Last month, New York City officials announced they had identified the remains of another three victims who died in the Sept. 11 attacks at the World Trade Center in lower Manhattan.

It was the latest update to come out of the missing persons unit of the New York City medical examiner’s office, which since 2001 has been running the forensic investigation into the deadliest terrorist attack in U.S. history.

But the news may have surprised those who didn’t know that many 9/11 victims still haven’t had any of their remains identified — and that city officials are still trying, 24 years later.

“One of the biggest questions we get is, ‘You’re still working on this? Why haven’t you finished?'” said assistant director of forensic biology Mark Desire, who leads the team working on World Trade

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