Presidential candidates on 9/11 remembrance

US presidential candidates Barack Obama and Mitt Romney have both tweeted on America's commitment to freedom, 11 years on from the 9/11 terrorist attacks.

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As painful as this day is and always will be, it leaves us with the lesson that no act of terrorism can ever change what we stand for. -bo

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On this most somber day, America is united under God in its quest for peace and freedom at home and across the world.

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9/11 victims remembered

Families of the victims of the 9/11 attacks in New York have paid tribute to their loved ones during a ceremony at Ground Zero. It is 11 years ago today that nearly 3,000 people died in the atrocity. President Obama led the memorial at Washington.