Hackers briefly disrupted some train services, amid suggestions that the attack came from Russia.
Polish intelligence services are investigating a hacking attack on the country's railways, Polish media say.
Hackers broke into railway frequencies to disrupt traffic in the north-west of the country overnight, the Polish Press Agency reported on Saturday. The signals were interspersed with recording of Russia's national anthem and a speech by President Vladimir Putin, the report says.Saturday's incident occurred when hackers transmitted a signal that triggered an emergency stoppage of trains near the city of Szczecin, PAP reported.Stanislaw Zaryn, a senior security official, said Poland's internal security service ABW was investigating. "For the moment, we are ruling nothing out," he told PAP.
"We know that for some months there have been attempts to destabilise the Polish state," Mr Zaryn added. "Such attempts have been undertaken by the Russian Federation in conjunction with Belarus."
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