Forensic scientists continue to work on identifying remains of people killed in the 9/11 attacks, 25 years later. Hundreds of people killed in the attacks still need to be identified.

Further details about this ongoing effort are available through an episode of Unsolved, featuring an interview with forensic scientist Dr. Michael Coble.

The episode discusses the work involved in identifying remains and how technology has evolved to make it possible to test remains that were previously considered too difficult.