Two Ukrainian nationals suspected of working for Russian intelligence have been named as suspects in two sabotage attempts on Polish railway lines, Polish Prime Minister Donald Tusk told parliament on Tuesday.

Tusk said the pair “had been operating and cooperating with Russian services for a long time,” citing information from prosecutors and investigators, according to Polish media reports.

He said authorities know the suspects’ identities but will not release them until the investigation progresses.

The two incidents, recorded between Saturday and Monday, damaged a rail line used to transport supplies to Ukraine.

Poland, a NATO and EU member, has become the main hub for moving military and humanitarian aid to its war-torn neighbor.

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The update comes a day after Tusk said that an explosion that destroyed part of the strategic Warsaw-Lublin railway line was a deliberate attack on national security.

“The explosion of an explosive device destroyed the railway track,” he wrote on X on Monday.

He called the blast “an unprecedented act of sabotage aimed at the security of the Polish state and its citizens” and vowed to track down those responsible “regardless of who is behind them.”

Police said a train driver first noticed the damage. No injuries were reported, but investigators later found additional damage along the same route.

Polish officials have repeatedly warned that the country’s central role in supporting Ukraine makes it a likely target for Russian hybrid operations – an allegation Moscow denies.

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The incidents come as Tusk steps up warnings that Russia is waging a covert war across Europe, using sabotage, arson attempts, drone incursions and cyberattacks to destabilize states backing Ukraine.

He said Poland remains secure thanks to NATO unity but urged Europe to take greater responsibility for its own defense.

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