The United States is marking the 14th anniversary of the September 11th terrorist attacks on Friday with a series of observances to remember that horrifying day.
Low clouds surround the top of the One World Trade Center tower, center left, at sunrise during the 14th anniversary of the terrorist attacks, Sept. 11, 2015.
Defense Secretary Ash Carter bows his head during a moment of silence at the Pentagon Memorial, Sept. 11, 2015, during a service on the 14th anniversary of the terrorist attacks.
On the 14th anniversary of the attack, a U.S. flag is draped on the side of the Pentagon, Sept. 11, 2015, where the building was attacked on September 11th in 2001.
President Barack Obama, first lady Michelle Obama and others observe a moment of silence to mark the 14th anniversary of the 9/11 attacks, on the South Lawn of the White House in Washington, Sept. 11, 2015.