Swedish state-owned utility Vattenfall AB said late Wednesday that it has found suspected explosives in a truck that was trying to enter its Ringhals nuclear power facility in southwest Sweden.
The company said its staff found the suspect material when carrying out normal security checks, with a sniffer dog confirming the vehicle was carrying explosives.
Police are at the scene and the Swedish Radiation Safety Authority has raised the level of protection at the site as a precaution, though the company stressed that the discovered object could not have caused any serious harm.
Swedish police bomb technicians also said there was no risk of an explosion as there was no ignition device present.
"The assessment is that the situation is under control," police spokesman Lars Grimbeck said.
Other nuclear stations in the country have raised their security level.
Ringhals nuclear power plant is the largest power plant in Scandinavia and its four reactors produce about 20 percent of all electricity in Sweden. It is owned by Vattenfall and the Swedish arm of Germany's E.ON.
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