Ground readings near one set of tanks stood at 2,200 millisieverts (mSv) on Tuesday, the plant operator and Japan's nuclear authority said.

Saturday's reading was 1,800 mSv.

Last month, Tokyo Electric Power Company (Tepco), the plant operator said it had found highly contaminated water leaking from a storage tank.
Other leaks have also been reported, prompting the government on Tuesday to pledge 47bn yen ($473m, £304m) in funding to tackle the problem.
The spike in radiation levels found on Tuesday was in the same area where the 1,800 mSv level was detected on Saturday, a spokeswoman from Tepco told Bloomberg.
The readings are thought to be high enough to provide a lethal dose in hours
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