Japanese authorities say they can't rule out the possibility of a nuclear meltdown at Unit 2 of its Fukushima plant. 

The reactor's fuel rods are now fully exposed - following Friday's earthquake - and after problems with coolant levels this morning. 

A meltdown increases the risk of a radioactive leak.


Millions of Japanese people are without food, water or power - and hundreds of thousands are homeless.

The country's suffered multiple aftershocks and a fresh tsunami scare this morning.

Disaster relief expert, Jeff Charlton, tells us what key skills are needed.

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