Polish authorities have arrested several people in connection with a blast that damaged a rail line linking Warsaw to the Ukrainian border over the weekend, state media reported Wednesday.

Jacek Dobrzyński, the spokesperson for Poland's secret services minister, said the suspects were being questioned but did not provide details on how many were detained, according to the Polish Press Agency, or PAP.

Poland's Prime Minister Donald Tusk has described the explosion as an "unprecedented act of sabotage." Foreign Minister Radosław Sikorski said it was "an act of state terror."

The blast damaged tracks near Mika, about 100 kilometres southeast of Warsaw. No one was hurt.

In a separate weekend incident, power lines were destroyed in the area of Puławy, about 50 kilometers from Lublin, in eas

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