An explosion on a Polish railway track on a route to Ukraine is an "unprecedented act of sabotage", Polish Prime Minister Donald Tusk says, vowing to catch those responsible for the incident he says could have ended in tragedy.

The blast on the Warsaw-Lublin line follows a wave of arson, sabotage and cyber attacks that has hit Poland and other European countries since the start of the war in Ukraine.

Warsaw has in the past held Russia responsible, saying Poland has become one of Moscow's biggest targets due to its role as a hub for aid to Kyiv. Russia has repeatedly denied being responsible for acts of sabotage.

"The blowing up of the railway track on the Warsaw-Lublin route is an unprecedented act of sabotage aimed at the security of the Polish state and its citizens," Mr Tusk wrote on

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