Seemed really surreal watching it, the reactions of people as the second plane hit and the knowing that this was no accident.

Then knowing that the tower would soon collapse but hearing the emergency services telling people to stay put.

I did wonder how many more would have got out if there had been told to just get out asap if they knew what we know now.

What really got me was the scale of the dust clouds and the density, blacking out a city. Seeing people running screaming as they followed and engulfed them.

It changed the world in so many ways.