Two Ukrainian citizens working for Russia are suspected of blowing up a railway line in Poland over the weekend, Polish Prime Minister Donald Tusk said Tuesday.

Speaking to the Sejm, the lower house of the Polish parliament, Tusk said the two suspects had been collaborating with Russia's secret services for a long time. He said their identities were known but could not be revealed to the public because of ongoing investigations. The pair have already left Poland.

As NATO allies accuse Russia of hybrid warfare, U.S. joins war games in Sweden focused on disrupting sabotage

Tusk has described the explosion on a rail line linking Poland's capital, Warsaw, to the border with Ukraine as an "unprecedented act of sabotage."

That rail line is being used to transport aid to Ukraine, Polish offic

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