Wrecked Fukushima plant springs highly radioactive water leak

An aerial view shows workers wearing protective suits and masks work at a construction site (C) of the shore barrier to stop radioactive water from leaking into the sea, at the tsunami-crippled Fukushima Daiichi nuclear power plant in Fukushima, in this photo taken by Kyodo August 9, 2013. REUTERS/Kyodo

TOKYO (Reuters) - Contaminated water with dangerously high levels of radiation is leaking from a storage tank at Japan's crippled Fukushima nuclear plant, the most serious setback to the cleanup of the worst nuclear accident since Chernobyl.

The storage tank breach of about 300 tonnes of water is separate from contaminated water leaks reported in recent weeks, plant operator Tokyo Electric Power Co said on Tuesday.