Japanese nuclear regulators have raised the severity of the latest leak of radiation-contaminated water at the damaged Fukushima plant to the level of "serious incident".
Plant operator Tokyo Electric Power Co (TEPCO) said last week about 300 tonnes of highly contaminated water had leaked from a storage tank at the Fukushima Daiichi plant.
The Nuclear Regulation Authority raised the severity of the leak on the International Nuclear Event Scale from level 1 - an "anomaly" - to level 3 on Wednesday.
The leak was the worst since the start of the nuclear disaster in 2011, the operator said.
Level 7 - "major accident" - was applied when three of the reactors suffered meltdowns.
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