President Barack Obama has attended a memorial service at the Pentagon to mark the 12th anniversary of the terror attacks. Along with prayers and speeches, a silence held to mark the moment American Airlines flight 77 crashed at the site, killing 184 people.
Relatives of those who died in the attack were among those who attended the service.
Princes William and Harry cracked jokes with each other as they made multi-billion pound deals for charity on a City trading floor.
A man widowed in the September 11 attacks has returned to the top of the World Trade Center to honour the memory of the wife he lost there.