This morning at 6am while fast asleep I heard our doors rattling. I immediately assumed that someone had entered or was trying to enter our house. I jumped up and while running grabbed my old tripod (as good as a baseball bat any day) ready to kick the living shit out of whoever it was that was stealing my stuff. The Mrs thought I’d gone mad!
When I got downstairs there was no-one in our flat and everything was secure. By this time Lené had also got up and said she also heard the noise. I was really baffled because I was sure I heard someone at our doors, but I couldn’t find anything untoward.
It was only when we started browsing the Internet several hours later that we discovered that it was a huge explosion north of London that was to blame. It must have been a massive explosion because there are reports that it was heard in France! Our doors were rattled very hard, but we were lucky; some people in London had their windows blown out.
Read more on the explosion at Massive explosions hit fuel depot (a BBC News article).
My jumping out of bed “armed” reminded me of my dad who actually caught people red-handed like this. And believe me you didn’t want to be caught stealing from my old man.
Attie Heunis's Journey 
I just saw it on MSNBC here in the States. They said that it is not terrorist related, which is of course the first thing that comes to mind.
My parents live in Secunda, where SASOL 2 and 3 are. They have had a couple of explosions like this over the past couple of years. The last one was last year across from my dad’s office. Fortunately he was not at his office at the time, since nothing was left of it.
Petrol/Gas is supposed to burn, and burn well, so anytime you have an explosion like this at a plant, it is very intense.
As of the last time I checked, there were no casualties, and about 40 injured.
casualty = injured. No deaths is what you meant I think..