New York City's medical examiner used a breakthrough test to identify the 1,651st World Trade Center victim.
Families of 9/11 victims called the judge's decision denying Saudi Arabia's bid to dismiss the lawsuit "the most consequential step yet" in two decades of litigation.
The medical examiner's office has never stopped testing remains recovered from the wreckage.
The country is marking 23 years since the Sept. 11 terror attacks. Here is how the Bay Area commemorated the anniversary and honored fallen heroes.
Here's how the terror attacks unfolded on September 11, 2001.
The move once again places the death penalty on the table for Khalid Sheikh Mohammed and the two other 9/11 accomplices.