Fears over Japan nuclear fallout

Fukushima number one is the hardest hit power plant so far. There was a hydrogen explosion on Monday morning at the plant's number three reactor. The blast was felt at least 40km.

A similar explosion happend at the same plant on Saturday, but at the Number one reactor. Workers were injured but no damage was reported to the container holding the reactor's radioactive core.

And a state of emergency had been reported at the Onagawa plant - although officials say radioactivity levels have now returned to normal.

As the prospect of a nuclear disaster looms, Japan's government says it's doing all it can.

Al Jazeera's Florence Looi reports.