Americans observe moment of silence for 9/11 victims

US President Barack Obama has led a moment of silence to mark the 12th anniversary of the 9/11 attacks.

Obama, along with the First Lady Michelle Obama, Vice President Joe Biden and his wife Jill, walked out of the White House at 1246 GMT - the moment the first hijacked plane hit the World Trade Center tower in New York:

Visit the NBC News website for live coverage of the 9/11 anniversary memorials

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9/11 anniversary memorials

Commemorations to remember the 9/11 victims are taking place on the 12th anniversary of the terror attacks.