Damage caused overnight on the intercity Warsaw-Lublin rail line near the village of Mika was an act of sabotage, Polish Prime Minister Donald Tusk posted on US social media company X.

"Unfortunately, the worst suspicions have been confirmed. An act of sabotage occurred on the Warsaw-Lublin line [village of Mika]. An explosive device detonated and destroyed the railway track. Services and the prosecutor`s office are working on the scene", the prime minister wrote.

He added that another incident on the same line, near Pulawy southeast of Warsaw, may also have been sabotage. Security services are investigating whether the events fit into a broader pattern of hostile activity targeting Polish infrastructure.

Early Sunday, a train driver reported "irregularities" on the Deblin–Warsaw route near the village of Zyczyn, around 100 km from the capital, according to police in Radom. Initial checks revealed deliberate damage to a section of track, prompting an immediate suspension of traffic.

Tusk said he remained in "constant contact" with Interior Minister Tomasz Siemoniak and that sabotage could not be excluded. "It cannot be ruled out that we are dealing with an act of sabotage… No one had been injured and that investigators were treating the matter with the highest urgency".

Poland, as a key transit hub for Western military aid to Ukraine, is considered especially vulnerable.