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The White House held a moment of silence and a performance of "Taps" on the South Lawn on Thursday (September 11) to mark the mark the 13th anniversary of the Sept. 11 attacks on the United States.
President Barack Obama, First Lady Michelle Obama and Vice President Joe Biden observed the moment of silence at 8:46 a.m., the time the first plane struck the Twin Towers at the World Trade Center in New York 13 years ago.
Nearly 3,000 people were killed that day when four jetliners were hijacked by militants from al Qaeda. Two planes crashed into the World Trade Center's twin towers, another hijacked plane plowed into the Pentagon, and a fourth hijacked plane crashed into a field in Shanksville, Pennsylvania.
