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Trains operated by the national rail network were halted across the Netherlands Sunday by what the operator called a technical problem.

Erik Kroeze, a spokesman for railway operator NS, said the problem was in a planning software system. He said there were no indications it was caused by a cyberattack.

NS said would be halted until 5 p.m. while it sought to fix the problem.

"We are working hard on , but unfortunately it is not yet possible to say how long this situation will last," NS said in a statement on its website.

Regional trains run by other operators were still running, NS said.