TOKYO —  Japan has declared a state of emergency at another nuclear power plant after a cooling system at its three reactor units failed following a massive earthquake. There has been no
radiation leak.

Japan's nuclear safety agency is also set to order a plant
operator of another plant to release slightly radioactive vapor to
protect the reactor from damage.
 

Altogether, five reactor units - two at the Fukushima No. 1
plant and three at nearby Fukushima No. 2 plant - are in a state of
emergency. All five plants have shut down after the massive quake
Friday.

Officials said earlier that only one of the two Fukushima No. 1
plant's units had cooling problems resulting from power outages.
They now say both units are troubled.