11 September 2013Last updated at 15:10 ET
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A police officer pauses during a moment of silence at the 9/11 Memorial’s reflecting pool
US President Barack Obama, First Lady Michelle Obama, Vice-President Joe Biden and Jill Biden observe a moment of silence on the South Lawn of the White House
A woman touches the metal plate with names of the 9/11 victims at memorial in New York City
A man gazes at the new One World Trade Center building as church bells toll for 9/11 victims
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The US is remembering the victims of the 9/11 attacks in a series of memorials marking the 12th anniversary.