A second explosion has hit the nuclear plant in Japan that was damaged in Friday's earthquake, but officials said it had resisted the blast, BBC reports
TV footage showed smoke rising from Fukushima Daiichi's reactor 3, two days after an explosion hit reactor 1.
The latest blast, said to have been caused by a hydrogen build-up, injured 11 people, one of them seriously.
Officials said the reactor core was still intact, and that radiation levels were below legal limits.
But the US military, which has been helping the relief effort, said it had moved away from the area after one of its aircraft carriers detected low-level radiation about 100 miles (160km) offshore.
Technicians have been battling to cool three reactors at the Fukushima Daiichi plant since Friday, when the quake and tsunami combined to knock out the cooling system.

Experts say a disaster on the scale of Chernobyl in the 1980s is highly unlikely because the reactors are built to a much higher standard and have much more rigorous safety measures.
Earlier, the prime minister said the situation at the nuclear plant was alarming, and the earthquake had thrown Japan into "the most severe crisis since World War II".
The government advised people not to go to work or school on Monday because the transport network would not be able to cope with demand.
The capital Tokyo is also still experiencing regular aftershocks, amid warnings that another powerful earthquake is likely to strike very soon.
Meanwhile, tens of thousands of relief workers, soldiers and police have been deployed to the disaster zone.
Preliminary estimates put repair costs from the earthquake and tsunami in the tens of billions of dollars, a huge blow for the Japanese economy that - while the world's third largest - has been ailing for two decades.