Japan says state of emergency at Onagawa - IAEA

VIENNA, March 13 (Reuters) - Japanese authorities have told the U.N. nuclear watchdog that the lowest state of emergency has been reported by the operator at the Onagawa nuclear power plant, the Vienna-based agency said on Sunday.

"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 International Atomic Energy Agency (IAEA) said in a statement.