Thousands are gathering today in New York, Washington, and Pennsylvania to mark the 16th anniversary of the 9/11 terror attacks.
On Sept. 11, 2001, Islamic terrorists hijacked airplanes and flew them into the World Trade Center and the Pentagon.
They crashed a third plane in a field in Shanksville, Pennsylvania when passengers tried to retake control.
Nearly 3,000 people died in the terrorist attacks that day.
Relatives, survivors, and rescuers will attend ceremonies at the three sites.
President Donald Trump, a native New Yorker, is observing the anniversary for the first time as the nation’s leader.
The president and first lady are scheduled to observe a moment of silence at about the time the first airplane hit.
President Trump will also observe the anniversary for the first time as the commander-in-chief at a ceremony at the Pentagon.
Vice President Mike Pence is delivering remarks at a ceremony at the Flight 93 National Memorial near Shanksville.
