I was sitting in my office near Vauxhall Bridge in South London. It was such a normal afternoon. I was writing a paper on something which seemed so very important at the time. I was in a shared office, blocking out distractions by listening to music on my headphones using my portable CD player. For some reason, I was listening to Bob Dylan.

Come senators, congressmen
Please heed the call.
Don’t stand in the doorway
Don’t block up the hall.
For he that gets hurt
Will be he who has stalled.
The battle outside ragin’
Will soon shake your windows
And rattle your walls
For the times they are a-changin

As, in my head, Dylan was singing those prophetic words, a colleague pointed at the TV in the corner of the room. It was a picture of an office block against a clear blue sky, and an airliner crashing into the side of the building. Minutes later, there were pictures of a second aircraft hitting the towers. A third plane hit the Pentagon, and a fourth crashed in a field in Pennsylvania.

Sorry, Bob. I don’t really enjoy your music, but in that moment, 25 years ago, you were absolutely right. Windows were shaking. Walls were rattlin’.

The times, they were a changin.

Richard Jackson: Horsham, West Sussex

In 2001, my major incident role was as Metropolitan Police Casualty Bureau Manager, supporting the identification of UK nationals involved in disasters of any kind, anywhere in the world.

On this 25th anniversary of 9/11, I’ve been remembering lots of people.