The Japanese government says an investigation is under way to establish the source of the radiation leak at the quake-hit Fukushima nuclear plant, which left two workers in hospital.
The plant's operator says dangerously high radiation levels recorded in water at one reactor raise the possibility its core has been damaged.
Meanwhile, the official death toll from the 11 March earthquake and tsunami has passed 10,000, police say.
More than 17,440 people are missing.
BBC News - Japan investigation into nuclear plant radiation leak
The plant's operator says dangerously high radiation levels recorded in water at one reactor raise the possibility its core has been damaged.
Meanwhile, the official death toll from the 11 March earthquake and tsunami has passed 10,000, police say.
More than 17,440 people are missing.
BBC News - Japan investigation into nuclear plant radiation leak
