Poland's Prime Minister Donald Tusk described an explosion on a railway line used for deliveries to Ukraine as an "unprecedented act of sabotage". The blast occurred on Sunday on a track connecting Warsaw to southeastern Poland. Tusk stated that authorities are investigating potential links to Russia, Belarus, or their proxies. He emphasized that Poland will identify the individuals responsible, stating, "whoever they are."

The explosion took place on a crucial route for transporting aid and weapons to Ukraine. Polish officials confirmed that an explosive device was detonated on the railway track between Warsaw and Lublin. They also reported damage to overhead cables along the same line, which they believe is likely related to the sabotage.

NATO Secretary-General Mark Rutte indicated that the alliance is in close communication with Polish authorities and is awaiting the investigation's findings. Tomasz Siemoniak, Poland's security services minister, noted that the likelihood of foreign services being involved in the incidents is "very high."

The investigation began after a train driver reported issues with the track around 7:40 a.m. on Sunday. Further inspections revealed damage near the village of Mika, approximately 100 kilometers southeast of Warsaw. Polish Interior Minister Marcin Kierwiński confirmed, "We can say beyond any doubt that an explosive device was detonated, damaging the railway tracks."

No injuries were reported among the two passengers and several staff members on the train at the time of the incident. Defense Minister Władysław Kosiniak-Kamysz announced that the military plans to examine 120 kilometers of the Warsaw-Lublin-Hrubieszów line, which connects the Polish capital to Ukraine.

Another train traveling on the same line was halted on Sunday night due to damaged overhead electrical cables, which affected several windows but did not result in injuries among the 475 passengers on board.

In a press conference in Brussels, Finnish President Alexander Stubb urged European nations to maintain composure in response to such incidents. He cautioned against overreacting to alleged Russian disruptions, stating, "this is unfortunately the new normal. What Russia is trying to do is to destabilize our societies through information and other campaigns."

Stubb also remarked on the blurred lines between war and peace, highlighting that Moscow is conducting both a kinetic war in Ukraine and a hybrid war in Europe. Russia has denied previous allegations of sabotage related to drone incidents and other disruptions in Europe.

As investigations continue, Polish officials remain vigilant about potential threats to national security and the stability of the region.