Eleven years ago today, 2,977 people were killed in New York City, Pennsylvania and at the Pentagon during the September 11, 2001 terrorist attacks.
This morning, President Barack Obama, first lady Michelle Obama and White House staffers observed a moment of silence on the White House south lawn in memory of the victims of 9/11.
With three bell tolls and a bugler playing taps, the White House observance marked the 11th anniversary of the suicide hijackings. The Obamas also planned to attend an observance ceremony at the Pentagon later Tuesday morning, and President Obama was also scheduled to visit wounded soldiers and their families at Walter Reed National Military Medical Center.
Vice President Joe Biden visited Pennsylvania to deliver remarks at the Flight 93 National Memorial Commemorative Service.
Watch President Obama speak about 9/11 below in his weekly address: