NHK reporting that reactor 2, Fukushima plant 1, exploded when workers tried to open closed valves.  Plant officials say highly possible that fuel rods are melting.

RT reporting that the fire in reactor 4 was a result of an explosion.  Chief Cabinet Secretary Yukio Edano says probably caused by hydrogen gas build up.

More reasons for confusing radiation level reporting.  Officials are giving readings for each reactor, not for the whole plant.  The problem is that there are 6 reactors at Fukushima plant 1.  4 reactors are now spewing radiation.

Radiation levels from just one reactor has reached levels that cause immediate and noticeable damage to humans. There are reports of people showing signs of radiation sickness.

Prefectures more than 240km from Fukushima plant 1, have reported increases in radiation readings.

Nuclear plant officials say they were successful in replacing pump motors on other reactors, which is resulting in dropping temperatures.