As the United States honors the 20th anniversary of the Sept. 11 attacks that shattered and changed American life, commemorations and memorials were held nationwide Saturday to remember the victims and first responders.

In New York, the ceremony at Ground Zero began with the first moment of silence at 8:46 a.m. — the time Flight 11 struck the North Tower of the World Trade Center. The last moment of silence came at 10:28 a.m., in observance of the fall of the North Tower. The reading of the names of the victims, an annual tradition, concluded at about 1 p.m.

Here’s what to know

  • President Biden stopped by the Shanksville Volunteer Fire Department in Pennsylvania after paying tribute to 9/11 victims.
  • Vice President Harris said in Shanksville that the dozens of passengers of Flight 93 responded in unity in “the most dire of circumstances.”
  • Former president George W. Bush, who said the victims of 9/11 “must always have an honored place,” warned that domestic terrorism could be as much of a threat as terrorism originating from abroad.
  • The young niece of Christopher M. Mozzillo, a New York firefighter who died responding to the terrorist attacks, said she misses the uncle she never had a chance to meet. “Even though I never met you in person, I still miss you a lot,” she said.