The United Stated marked the 11th anniversary of the 9/11 terrorist attacks Tuesday with ceremonies, prayer and moments of silence for the victims. Events took place around the country, including where three terrorist-guided planes struck in New York City and at the Pentagon, as well as where a fourth plane crashed Pennsylvania.
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U.S. President Barack Obama and first lady Michelle Obama observe a moment of silence on the 11th anniversary of the September 11 attacks, on the South Lawn of the White House in Washington, September 11, 2012.
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Scott Willens, who joined the U.S. Army three days after the terrorist attacks of 9/11, pauses by the South Pool during memorial ceremonies for the 11th anniversary of the terrorist attacks at the World Trade Center site in New York City.
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Tina Grazioso, left, looks at the name of her husband, John Grazioso, who died in the 9/11 terrorist attacks on the World Trade Center, during the 11th anniversary observance of the attacks at the World Trade Center Memorial in New York. At right is John Grazioso's sister, Carolee Azzarello.
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Katie Pakenham, left, whose brother was killed in the attacks on the World Trade Center in 2001, and Teresa Methai, whose husband Joseph Methai was also killed, embrace each other as they stand in front of the 9/11 memorial on Boston Public Garden, following a wreath laying ceremony in Boston on the 11th anniversary of the attacks.
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A New York City policeman salutes a flag hanging from One World Trade ceremonies for the 11th anniversary of the terrorist attacks on lower Manhattan at the World Trade Center on September 11, 2012, in New York City.