At least 50 people have been killed and hundreds injured, some seriously, after a series of explosions on London's underground network.
The blasts caused panic across London
BBC News website reader Scott Wenbourne was on the train travelling in to Aldgate station when there was an explosion in the carriage in front of him.
It was about 8.50am when it happened. I was one carriage down from where it happened and had my back to the carriage door.
All of a sudden there was a loud bang and a flash of bright light. It threw me to the floor in the middle of the train.
At first some people thought it wasn't serious, perhaps just a minor derailment, although some people were screaming.
But straight away, as soon I hit the floor my first thought was "it's a bomb", although I can't be sure.
It all happened in slow motion, I thought the windows would blow through.
Carriage 'ripped apart'
One of the train staff came along and said that we had hit something but that there was no need to panic.
We got off at the back end of the train and they walked us towards Aldgate station.
As we walked up past the carriage we saw debris and torn metal. I noticed the carriage was completely ripped apart on one side.
I saw three bodies on the track. I couldn't look, it was so horrific. I think one was moving but I'm not too sure.
There were also, I think, some bodies in the carriage, some were moving but I couldn't really look. No-one was attending to them.
We walked to the platform, which took about half an hour as there were so many of us, after all it was rush hour.
There were police at the platform and some of the injured were tended to.
Many people had black faces, bleeding from parts all over their bodies. Nobody seemed to have anything too horrific, they all seemed to be conscious.
As soon as I got out the station I phoned my mum to tell her I was OK. Someone from work called as well. I just stood around for a bit trying to take in what happened.
When I got to work one girl said she was just getting off the train at Liverpool Street when she felt the whole building rock.
We've been told at work to stay in the building, pull the blinds down and keep away from the windows.