BBC says Prime Minister Naoto Kan urges people to take "responsible actions", and listen to the media.
Edano says Japan will allow Fukushima plant owner Tepco to fill the reactor with sea water to cool it down, and that there was an explosion at the plant, but not at the reactor container.
He also says that data shows amount of radiation levels decreased after the explosion, and that the amount of radiation is staying at a low level.
Edano says no explosion at nuclear reactor container at Fukushima plant.
Chief Cabinet Secretary Edano says no large amount of radiation leakage is expected.
The Japanese national weather forecaster says the wind around the Fukushima plant is blowing from south to north, putting residents on the north side of the facility at greater risk of any effects, although the government says radiation levels are remaining low.
Kyodo reports that Nissan and Honda have joined Toyota in shutting Japanese factories. Two of Nissan's three factories have been damaged by the quake. Other firms to shut installations are Nippon Steel, Toyo Tire & Rubber and Sumitomo Rubber Industries. Mitsubishi Electric and NEC are to check production lines to assess whether to resume production on Monday.
hugo - a number of people throughout the morning have mentioned talk of a meltdown on German televsion. We have heard no suggestion of one having taken place, however, the latest news is that there is a low level radiation leak.
A bit of a round up on what Chief Cabinet Secretary Edano said earlier, which also address some of the questions people are asking:
"The nuclear reactor is surrounded by a steel reactor container, which is then surrounded by a concrete building," Chief Cabinet Secretary Yukio Edano said. "The concrete building collapsed. We found out that the reactor container inside didn't explode. We've confirmed that the reactor container was not damaged. The explosion didn't occur inside the reactor container. As such there was no large amount of radiation leakage outside."
@Rubicant We cannot confirm that. Last heard the U.N. nuclear watchdog was urgently seeking information from Japanese authorities. There has been no word from the IAEA since.
The NHK is reporting that a strong quake has hit Fukushima in Northern Japan.
A Jiji report says three workers have suffered radiation exposure near Fukushima nuclear plant
And in confirmation of what was being speculated earlier, Japanese authorities have told the IAEA they are making preparations to distribute iodine to people living near the nuclear power plants. Iodine can be used to help protect the body from radioactive exposure.