WARSAW, Poland —

A railway line linking Warsaw to southeastern Poland was damaged by a weekend explosion that the prime minister on Monday called an act of sabotage.

Prime Minister Donald Tusk, who visited the site, said that the line is “crucially important for delivering aid to Ukraine.”

“Unfortunately, the worst fears have been confirmed,” Tusk said in a statement. “An act of sabotage has occurred on the Warsaw-Lublin route (in the village of Mika). An explosion has destroyed the railway track.”

A train driver on the line between the capital, Warsaw and Lublin reported track irregularities around 7:40 a.m. Sunday. Further inspection determined there was damage to a section of track near the village of Mika, about 100 kilometers (62 miles) southeast of Warsaw, officials said.

It was

See Full Page