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    Watch: Moments from ceremonies marking 21 years since 9/11 attacks

    02:24
  • FBI releases declassified document into links between Saudi Arabia and 9/11 hijackers

    04:38
  • As US remembers 9/11, Taliban tightens its grip on Afghanistan

    03:46
  • Watch: Divers install American flag underwater to commemorate 9/11

    01:24
  • Watch: Biden, Harris take part in wreath-laying ceremony at Pentagon

    03:28
  • Welsh Guards soldiers perform U.S. national anthem in British memorial to 9/11

    01:21
  • Investment banking firm’s foundation pays college tuition for children of those lost on 9/11

    02:33
  • Watch: Emotional moments from 9/11 20th anniversary ceremonies

    03:20
  • Bells toll, names read at Shanksville 9/11 ceremony to mark Flight 93 crash

    02:38
  • ‘Taps’ performed at Pentagon ceremony following moment of silence

    01:08
  • Full speech: Pres. Bush delivers remarks at Shanksville 9/11 ceremony on 20th anniversary

    09:10
  • ‘Unity is possible in America’: Harris honors 9/11 anniversary

    08:18
  • Moment of silence marking when United Flight 175 struck south tower

    01:07
  • 9/11 20th anniversary: Procession and moment of silence held at time north tower was struck

    01:46
  • Full Special: ‘America Remembers 9/11: 20 Years Later’

    01:45:17
  • ‘It’s about each individual life’: Former N.Y. Gov. Pataki recalls 9/11

    04:08
  • Where the threat of terrorism stands 20 years after 9/11

    03:24
  • NBC News journalists remember covering 9/11 attacks

    04:31
  • 9/11 families sue Saudi Arabia government for alleged complicity in attacks

    04:55
  • Meet the FDNY firefighters who served in Air Force together after 9/11

    06:06

Former FDNY chief recounts 9/11 attacks 20 years later

03:14

Former FDNY Chief Joseph Pfeifer was on a routine run in lower Manhattan when he saw a plane aim and crash into the World Trade Center on September 11, 2001. Pfeifer was initially in charge at the scene and made critical decisions that likely saved thousands of lives.