WARSAW, Poland — Poland’s Prime Minister Donald Tusk said Monday that an explosion on a section of railway line used for deliveries to Ukraine was an “unprecedented act of sabotage.”

A Polish security official told The Associated Press that authorities are investigating whether the blast on Sunday on the line linking Warsaw to southeastern Poland is connected to Russia, Belarus or their proxies.

Tusk has vowed that Poland will catch the perpetrators, “whoever they are.”

While visiting the site Monday, the prime minister said the incident had taken place on a line that is vital for delivering aid to Ukraine. Polish officials said they were sure an explosive device had been detonated on a section of track between Warsaw and Lublin and later discovered damage to overhead cables on the same

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