主题：3/11 下午3时左右,东京地震，已进入灾害应急模式 -- xxxxxxxx

A STATE of emergency has been declared at a Japanese nuclear facility at Onagawa after excessive radiation levels were recorded there following Friday's earthquake, the UN atomic watchdog.

"Japanese authorities have informed the IAEA that the first or lowest state of emergency at the Onagawa nuclear power plant has been reported by Tohoku Electric Power Company," the International Atomic Energy Agency said.

The alert was declared "as a consequence of radioactivity readings exceeding allowed levels in the area surrounding the plant".

"Japanese authorities are investigating the source of radiation," the watchdog said.

According to the authorities, the three reactor units at the Onagawa nuclear power plant "are under control".