Two Polish men have been arrested for hacking into the national railway’s communications network, causing disruptions to traffic. The arrest took place in the city of Bialystok, and the police also seized radio equipment from the suspects’ apartment. The hacking incident occurred near the city of Szczecin on Friday night, resulting in the issuance of stop signals and delays for around 20 trains. Traffic resumed a few hours later. Similar attacks continued over the weekend in other parts of the country but did not cause major problems. Media reports indicated that the Russian national anthem and a speech by President Vladimir Putin were played during the attacks. The incident is currently under investigation by the country’s internal security agency. Although there have been recent accidents on Polish railways, including derailments, there is no evidence linking them to the hacking incidents.