Polish Prime Minister Donald Tusk says two Ukrainian citizens allegedly working for Russia are suspected of blowing up part of a railway line near Warsaw over the weekend.

The two Ukrainians are accused of working on behalf of Russian intelligence to damage a railway line that was travelling to the border of Ukraine, Poland’s close ally, Tusk said on Tuesday.

While Polish authorities are aware of the suspects’ identities, they would not be made public pending further investigation, Tusk told the Polish lower house of parliament.

The pair “have been operating and cooperating with Russian services for a long time”, he added, citing information from prosecutors and investigating authorities.

On Saturday, an explosion damaged the tracks near the village of Mika, about 100 kilometers (60 mi

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