President Barack Obama is paying his respects at the Pennsylvania site where a hijacked jet crashed during the Sept. 11 terrorist attacks.
Obama and his wife, Michelle, visited the Wall of Names. Each of the 40 marble slabs is inscribed with the name of someone killed in the crash of United Flight 93.
The hijacked plane slammed into a field in Shanksville, 60 miles southeast of Pittsburgh, as the passengers and crew tried to regain control of the aircraft from the four hijackers.
Investigators later determined that the hijackers intended to fly the plane into the White House or the U.S. Capitol, where Congress was in session on Sept. 11, 2001.
The Obamas arrived in Shanksville after visiting New York City's Sept. 11 memorial in lower Manhattan.