Presidents Joe Biden, Barack Obama and Bill Clinton all gathered at the site where the World Trade Center towers collapsed twenty years ago.
The presidents, joined by their wives; First Lady Jill Biden, Michelle Obama and Hillary Clinton, stood somberly side by side on Saturday to pay tribute to the nearly 3,000 people who died on that day.
A moment of silence was held at 8:46 AM; the time that American Airlines Flight 11 crashed into the North Tower of the World Trade Center. The second moment of silence was held at 9:03 AM, when United Airlines Flight 175 crashed into the South Tower of the building. The final moment of silence happened at 9:37 AM, when Flight 77 crashed into the Pentagon.