Polish Prime Minister Donald Tusk said an explosion on a railway track connecting the capital Warsaw to the southeastern city of Lublin was "an act of sabotage."

Poland has identified two people responsible for an explosion on a railway route to Ukraine, prime minister Donald Tusk said on Tuesday, adding that they were Ukrainians who collaborated with Russian intelligence and that they had fled to Belarus.

Prime Minister Donald Tusk says two Ukrainian citizens working for Russia are suspected of blowing up a railway line in Poland.

Polish Prime Minister Donald Tusk said the "worst suspicions have been confirmed" and that a bomb had destroyed rail track after "an act of sabotage" along the Warsaw to Lublin route.

Poland identified two Ukrainians, linked to Russian intelligence, responsible for a railway explosion on the Warsaw-Lublin line. Prime Minister Donald Tusk stated they fled to Belarus following the incident.

A train track between the Polish cities of Warsaw and Lublin was destroyed in an “unprecedented act of sabotage” over the weekend, Polish Prime Minister Donald Tusk said Monday, noting that the railway is “crucially important for delivering aid to Ukraine.