I've just got back home from Yorkshire via central London, and thought I'd write an account of the morning's events while my memories are still fresh...

I arrived at Kings Cross from York at 9.30 and was initially annoyed that the staircase down to the tube platforms was sealed off. That annoyance turned to genuine bafflement when it turned out that the whole station was sealed off, and the police weren't letting anyone out.

The exit to York Road was still open, though, so I came out and turned right, expecting to have to walk along to Euston Square. That turned out to be a daft idea when I saw the chaos outside the station - the roads were gridlocked, and people were swarming everywhere. I decided to head down to Russell Square and either get a bus or hop on the Piccadilly line (if it was running).

Loads of people had the same idea as me, so I weaved through the confused commuters and was eventually coming down Marchmont Street towards Russell Square station when I heard a loud explosion. That was the bus on Tavistock Square, but I didn't know it was a bus at the time.

I kept walking until a wave of panicking people shouting "go back!" swept past me in the other direction. A policewoman walking behind them confirmed that it was indeed an explosion and that the whole area was being sealed off. At this point I thought I'd phone the office to tell them I wouldn't be able to make it in.

As I made my way eastwards, there were still huge waves of commuters coming down towards Russell Square who were unaware of Tavistock explosion. It was impossible to get them all to turn back, so those of us heading away just talked to who we could and pushed against the tide.

Eventually I made it back to Angel, via quite a roundabout station-avoiding route. What I'd heard at this point, through text message exchanges with Guy and brief phone conversations with Fiona at work, was that there had supposedly been a series of power surges on the tube network, that it had been shut down, and that people with blackened faces had been emerging from tube stations. I knew that power surges weren't to blame at Tavistock Square, having heard the explosion, and the general semi-militarisation that had gripped central London - helicopters circling overhead, police everywhere, entire areas roped off.

The bus I boarded at Angel had just been prevented from going south of City Road, so it had kicked out the passengers turned round to go back towards Hackney. Within seconds of sitting down we new passengers were all talking about the "situation".

Everyone was quite surprised to hear about the Russell Square explosion, but a few minutes into the journey we all got a bit of a shock when we found out that it had been a bus. I got a text from my flatmate saying "stay off the buses!" just as an American, on the phone to his net-surfing wife, got the same piece of news. The conductor wasn't happy to hear this at all, and spoke of resigning, while we all laughed nervously and seriously considered leaping off at the next set of lights.

So eventually I made it back home and wrote this blog entry. Looking back at the events of the last few hours, a few things come to mind: for example, the speed at which the police had sealed off the Russell Square area was surprising. They were roping off the bottom of Marchmont Street within two minutes of me hearing the explosion, which goes how to show how serious the situation was being taken by them even then, fairly early on.

Also, the initial story about power surges would seem to have been intended to enable a mass evacuation of the tube network without an accompanying mass outbreak of panic. It's strange to imagine what the atmosphere would have been like at Kings Cross at 9.30am if it was common knowledge that bombs had been going off; most of us were in the state of agitated determination that commuters enter when tube lines are shut down and routes need to be recomputed. If panic had swept through the crowd, it would have been a shitstorm.

At the time of writing it looks as though the fatality rate is low - two dead at Aldgate - so let's hope that that remains the case.