The Fukushima-Daini nuclear power station in northern Japan. Water overflowed from spent nuclear fuel storage pools at the Fukushima-Daiichi and Fukushima-Daini nuclear power stations operated by Tokyo Electric Power Company following an earthquake that struck off the coast northeastern late on Saturday night.

The pools are at the Unit 5 and 6 reactor buildings at Fukushima-Daiichi, which are being decommissioned, and the Unit 1 reactor building at Fukushima-Daini, which is set to be decommissioned.

According to the Nuclear Regulation Authority, it has been confirmed that no water leaked outside the buildings and cooling of the nuclear fuel at the two Fukushima stations has not been affected.

The International Atomic Energy Agency said it had been informed by the NRA that there was no damage to the two nuclear stations, or to a third at Onagawa, which is to the north of Fukushima in Miyagi prefecture.

The IAEA said the 7.1 magnitude earthquake occurred at a depth of 60 km, some 90 km off the coast of Fukushima prefecture at 23:08 local time.