Sweden has raised the security level at its nuclear power plants after explosives were found on a truck at the south-western Ringhals atomic power station, Belfast Telegraph reported.

The government forensic agency said the "explosive materials", which had no igniting device, were found during a routine check at an industrial site near the power plant yesterday. Police spokesman Tommy Nyman said today that they were investigating possible sabotage but had no suspects.

Sweden has 10 nuclear reactors providing about half of the country's electricity. There are four reactors at Ringhals, which is controlled by energy companies Vattenfall and E.ON.