BBC Business News
24 July 2013 Last updated at 01:07 GMT Help
Workers at the crippled Fukushima nuclear plant in Japan say they have seen steam rising from one of the damaged reactor buildings, for the second time in less than a week.
The company that runs the plant - Tokyo Electric Power Company, also known as Tepco, says it has not been able to establish where the steam is coming from.
The news comes a day after Tepco admitted for the first time that radioactive contaminated water is still leaking from the plant in to the sea.
Rupert Wingfield Hayes reports from Tokyo
