Solemn memorials are being held in New York, Washington and Pennsylvania among other places to honor the victims of the September 11, 2001 terror attacks.
September 11 Anniversary
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Two people with shirts commemorating New York City Fire Department firefighter Frankie Esposito sit at the south reflecting pool at the 9/11 Memorial during ceremonies marking the 12th anniversary of the attacks.
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Visitors to the Flight 93 National Memorial participate in a sunset ceremony with a giant flag memorializing Flight 93, Sept. 10, 2013.