About 300 tons of radioactive water leaked from storage tanks at a damaged nuclear power plant in Japan, the operator said on Tuesday.
Tokyo Electric Power Co said it had not identified the source of the leak at its Fukushima Daiichi plant, and conceded that the toxic water had likely flowed into the soil.
The operator said on Monday that puddles with extremely high radiation levels had been found near the storage tanks.
Tokyo Electric has been struggling to contain leaks at the plant as it continues to inject water into three reactors to keep them cool.
The reactors suffered meltdowns after the complex was struck by the March 2011 earthquake and tsunami.
The operator said earlier this month that it had known that an estimated 300 tons of radiation-contaminated water was flowing into the Pacific Ocean daily from the plant.