I believe what happened in Texas is called an industrial accident. Any other idea is just some delusional nutjob masturbating in a puddle of his own piss.
I don't know the cause of this one, but these types of explosions happen in Texas all the time. All over Texas and Houston, you hear about them in the local news every few weeks or months. They usually aren't this big though.
I remember when i was really young, there was a tank explosion like 30 miles from my parent's house and you could still feel it. It was like a bomb going off. There are so many of these explosions in Houston because of all the oil/gas/chemical plants. Texas has a shitload of plants like the one near Waco, they are everywhere.
