"Japan's Fukushima Nuclear Plant Leaks Radioactive Water"

"Around 100 tonnes of highly radioactive water have leaked from a storage tank at Japan's Fukushima nuclear plant, operator Tokyo Electric (Tepco) says."

"The toxic water may have overflowed after a valve was left open by mistake, Tepco said.

However the water was unlikely to have reached the ocean, the operator added."

BBC News had the story February 20, 2014.