View from mountains of Fukushima nuclear plant
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Fukushima: Water pouring down from hills

23 August 2013 Last updated at 07:23 BST

Japan's nuclear watchdog has said the crippled Fukushima nuclear plant is facing a new "emergency" caused by a build-up of radioactive groundwater.

In the mountains above the crippled Fukushima nuclear plant, rainfall collects and flows down to the Pacific - through highly contaminated ground.

The Nuclear Regulatory Authority says a barrier built to prevent that water reaching the ocean has already been breached, while tanks built to contain it are nearly full.

Rupert Wingfield-Hayes reports from Fukushima.