A reactor at a nuclear power station in northern France has been shut down automatically after smoke was given off, according to the operator EDF.
It says the installations at the plant at Penly are secure and no-one has been injured.
The alarm was raised shortly after midday and two dozen fire engines were mobilised to help EDF’s own crews.
France produces most of its electricity from nuclear energy. According to French media, the plant at Penly came into service in 1990.