US President Barack Obama has said the annual act of remembrance for the victims of the 9/11 attacks provides the chance to recommit the nation's values.
In an address at the Pentagon in Washington, Mr Obama said: "No act of terrorism can change what we stand for."
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Aaren O'Connor, 25, did not know she had been shot and kept telling dad David "my head hurts" before becoming incoherent.
Britons are shunning trips to Disneyland Paris following the November terror attacks in the French capital.