Twenty-five years later, ABC News remembers those lost on 9/11 and honors the bravery of the first responders during and after the Sept. 11, 2001 attacks.

Twenty-five years later, ABC News remembers those lost on 9/11 and honors the bravery of the first responders during and after the Sept. 11, 2001 attacks. ↧ 9/11 25th anniversary live updates: Families gather for ceremonies ... Friday marks 25 years since the Sept. 11, 2001, terror attacks, which claimed the lives of 2,977 people at the World Trade Center, the Pentagon and Shanksville.