Approximately 5.5 tonnes of water contaminated with radioactive materials have leaked from equipment at Japan’s Fukushima Daiichi nuclear power plant, local media reported Wednesday.

At around 08:53 local time on Wednesday, workers discovered a water leak at the outlet of a device used for purifying contaminated water, Fukushima Central television reported, citing Tokyo Electric Power Company (TEPCO), the plant’s operator.

TEPCO estimates that the amount of leaked water was about 5.5 tonnes, which may contain 22 billion becquerels of radioactive materials such as cesium and strontium, according to media reports.

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