An official says low radioactivity has been unexpectedly detected in two places outside one of the two reactors at a Czech nuclear power plant.
Temelin plant spokesman Marek Svitak says the radioactivity was at very low levels and poses no safety threat.
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The reactor where radioactivity was detected is currently shut down for planned maintenance.
Svitak said Friday the Czech nuclear authority and authorities in nearby Austria have been informed.
Environmentalists in Austria have demanded that the plant be closed because of security concerns, but Czech authorities insist it is safe.