Radioactive tritium levels in the seawater at the Fukushima Daiichi nuclear plant's port have increased, Tokyo Electric Power said. A sample contained about 1,100 becquerels per liter, the highest figure since the plant's meltdown in March 2011, TEPCO said. Polluted groundwater could be leaking from the plant site into the port, an official with Japan's Nuclear Regulation Authority said.

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