A third explosion at the Fukushima Daiichi nuclear power plant in Japan has increased the risk of nuclear meltdown.
The container vessel of the plant's No 2 reactor was damaged by a blast today, similar to two explosions at the No1 and No 3 reactors which occurred on Friday and Monday respectively.
Sea water is currently being pumped to the plant to cool the three reactors and tackle a fire at a fourth unit.
Japanese Chief Cabinet Secretary Yukio Edano told Bloomberg that 400mSv of radiation has been identified at the No 2 and No 3 reactors.
This is 20 times the annual limit for nuclear industry employees and uranium miners, according to the World Nuclear Association (WNA).
Residents living within a 30km radius of the plant have been urged to stay indoors.
Large areas of the country continue to suffer from rolling power cuts following the earthquake and resulting tsunami that occurred last week, which are estimated to have killed around 10,000 people.