Sorry to alarm folks, but the BBC is reporting a third explosion at the crippled Fukushima nuclear power plant in Japan, this time at the previously intact, but failing Number 2 reactor.
The explosion is feared to have damaged the reactor's pressure-suppression system, Kyodo says. It adds that "radiation tops legal limit" after the explosion.
It was the Number 2 reactor whose fuel rods were twice exposed today, raising fears of a potential meltdown. A Tokyo Electric spokesperson says that the company has started to evacuate staff from the plant, but that 50 workers were staying on. More details as they come.
UPDATE: Initial reports seem bad. The BBC is reporting that "Radioactive materials are feared to be leaking at Fukushima," while Japan's Kyodo News agency says that Tokyo Electric detected "radiation of 8,217 micro sievert per hour, 8 times annual limit."
There are unconfirmed reports that the evacuation zone is about to be expanded to 75 kilometers.