"Emergency services and the prosecutor's office are working at the scene," Tusk said. "On the same route, closer to Lublin, damage has also been identified."
In a later post, Tusk said the incident was "an unprecedented act of sabotage targeting directly the security of the Polish state and its civilians. This route is also crucially important for delivering aid to Ukraine."
"We will catch the perpetrators, regardless of who their backers are," Tusk added.
Polish Interior Minister Marcin Kierwinski echoed Tusk's assessment in a post to social media.
The damage to the railway was discovered on Sunday.
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