TEPCO looks for outside help to stabilize Fukushima . The alert is Japan 's gravest warning since meltdowns at the nuclear plant in 2011 . Comment: A storage tank at the plant leaked hundreds of tons of toxic water . A government minister this week criticized the plant operator 's handling of leaks .
The alert is Japan 's gravest warning since meltdowns at the nuclear plant in 2011 . Comment: A storage tank at the plant leaked hundreds of tons of toxic water . A government minister this week criticized the plant operator 's handling of leaks .