Former officials in Riyadh questioned under oath, but those depositions remain under seal, angering families of victims demanding accountability

Two-time Pentagon chief had a storied career in government under four presidents, but his vision of a modern US military was unraveled by the long and costly war in the Middle East

New administration defies Trump timetable, sets 20th anniversary of 2001 terrorist attacks as homecoming for 2,500 remaining soldiers

Cole James Bridges believed he was communicating with Islamic State; provided detailed instructions on tactics for terror attacks, including on American soldiers in Mideast

US president-elect says he can prep without daily report, but experts warn enemies won't wait, citing 9/11 as case of danger stemming from slow-walking transition work

Americans commemorate victims of deadliest terror attack on US as nation grapples with COVID-19, racial tensions and fraught political scene ahead of presidential election

Democratic candidate greets Pence, his successor as VP, during commemoration at Ground Zero; president holds moment of silence at 8:46 a.m., when first plane hit the Twin Towers

Dueling events will be held for 2001 terror attack in New York, after officials spark outcry by deciding to cancel traditional reading of victims' names due to COVID-19

Devastating 2001 events symbolize terrorism for many Americans, causing them to underestimate risk for homegrown, far-right extremism, experts say

Stephen Cooper, 78, an electrical engineer, was photographed running from the collapsing World Trade Center towers by the Associated Press's Suzanne Plunkett