WARSAW, Poland (AP) — Two Ukrainian citizens working for Russia are suspected of blowing up a railway line in Poland over the weekend, 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 the Russian 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, exiting via the Terespol border crossing to Belarus, he said.

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