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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A man walks through the Empty Sky memorial at sunrise across from New York's Lower Manhattan and One World Trade Center in Liberty State Park in Jersey City, New Jersey, Sept. 11, 2013.
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FDNY Firefighter Mike Bellantoni prepares a memento at the Firefighter's Memorial adjacent to the One World Trade Center, Sept. 11, 2013.
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Britain's Prince Harry and Prince William take part in a trade on the floor of BGC Partners as part of a 9/11 commemoration, London, Sept. 11, 2013.
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Former Mayor Rudy Giuliani and New York City Mayor Michael Bloomberg attend a ceremony at the 9/11 Memorial marking the 12th anniversary of the attacks on the World Trade Center, Sept. 11, 2013.