9/11: Peter Negron - 'I haven't stopped missing my dad'
11 September 2011 Last updated at 19:51 BST
Ceremonies are being held in the US to honour the victims of the 9/11 attacks, 10 years after the event.
Peter Negron was 11 years old when he lost his father Pete in the attacks on the World Trade Center.
He was one of the many relatives who paid tribute at Ground Zero to family members killed on that day.
He said he had not stopped missing his father.