From BBC log
1009: "This is starting to look a lot like Chernobyl" Walt Patterson, an associate fellow with Chatham House, has told the BBC after seeing pictures of the explosion at the Fukushima-Daiichi nuclear plant. "The nuclear agency says that they have detected caesium and iodine outside the unit, which certainly indicates fuel melting at the very least," he says. "Once you have melting fuel coming into contact with water, that would almost certainly be the cause of the explosion."
EDIT: On the plus side, the four workers injured in the explosion are not so bad:
1103: Japan's Kyodo news is also reporting that the four people injured in the nuclear plant explosion are conscious and their injuries are not life-threatening.