Zacarias Moussaoui is serving a life sentence at a federal prison in Colorado after narrowly escaping the death penalty.
Mohammed al-Qahtani has been held at Guantanamo for 18 years but never charged.
The testimony in Guantanamo is an important milestone in the Sept. 11 war crimes proceedings.
The rookie sensation donated custom cleats and a bat honoring first responders that he used in a game on the 18th anniversary...
The late Army Col. Rick Rescorla acted heroically as a civilian in the south tower of the World Trade Center on Sept. 11.
The president was in New York City when the World Trade Center was hit.
Ayman al-Zawahri called Wednesday on Muslims to attack U.S., European, Israeli and Russian targets in a speech.
President Trump pledged that the 18-year old war against the Taliban will go on to erase a threat against the homeland.
Eighteen years after the deadliest terrorist attack on American soil, the nation is still grappling with the aftermath.
It was the first major attack in the Afghan capital since President Donald Trump abruptly called off U.S.-Taliban talks.