Sep 11, 2013 9:39 AM
The moment of silence at 8:46 a.m. marked the time when the first plane hit the twin towers in 2001.
Families of the victims started reading aloud the names of those who died.
A second bell tolled at 9:03 a.m. to mark when the second plane hit the twin towers.
Former Mayor Rudy Giuliani and former Gov. George Pataki attended, as well as Mayor Michael Bloomberg, Gov. Anthony Cuomo and New Jersey Gov. Chris Christie.
And President Obama marked the 12th anniversary of the September 11th attacks with a moment of silence on the South Lawn of the White House.
Obama, along with first lady Michelle Obama, Vice President Joe Biden and wife Jill Biden, walked out of the White House at 8:46 a.m., the moment the first plane hit the World Trade Center tower in New York a dozen years ago.
They bowed their heads to observe a moment of silence, which was followed by a bugler playing taps.
The president then attended a September 11th ceremony at the Pentagon.
He also plans to mark the anniversary by participating in a volunteer project.
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