Japan raises nuclear alert

The Japanese nuclear disaster is 100 times worse than officials first thought.

The severity level of the nuclear crisis at the quake and tsunami damaged Fukushima plant has been raised from five to seven, the highest level on the international scale, and on a par with Chernobyl - the biggest nuclear disaster ever.

It comes as Japan was hit by yet another series of powerful aftershocks on Tuesday.

Anu Nathan reports.