New York remembers 9/11 on 11th anniversary of attacks
11 September 2012 Last updated at 13:38 BST
Events are being held to mark the 11th anniversary of the September 11 attacks.
In New York the names are being read out of the 2,983 people who were killed in New York, the Pentagon and in Pennsylvania.
Relatives of the dead will take it in turn to read out names.
They will pause for moments of silence marking the time when each of the four planes, hijacked by al-Qaeda, crashed.
Another two moments of silence will be observed for the times when the two towers collapsed.