Follow live coverage of the 9/11 annual commemoration ceremony at Ground Zero, Trump’s speech at the Pentagon, memorials in Shanksville, Pa., and more.

New York City is expected to release more than 170,000 pages of previously undisclosed records about air quality following the September 11, 2001, attacks, showing city officials at the time knew conditions around Ground Zero were unsafe to breathe despite repeated assurances to the public.

A Brooklyn native turned Central New Yorker has made it his life’s mission to share with others what he experienced for nine straight months at Ground Zero directly following

Records shed new light on what officials knew about post-9/11 air quality.

As deaths from 9/11-related illnesses surpass 6,000, advocates are pressing New York City to release decades-old records detailing air quality and toxic exposures at Ground Zero

Members of "Operation Chefs With Spirit" reflect on the tragedy 25 years later.

Mark Olsen entered Ground Zero with rolls of film three days after 9/11. Twenty-five years later, his photographs preserve what he witnessed.

More than 300 dogs played vital roles in the search and recovery efforts following the September 11 terrorist attacks.