Poland's Foreign Minister Wlodzimierz Cimoszewicz insists his country wants a U.N. mandate for any stabilization force.
CNN: Analysis: Battles ahead over U.N. role
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Firefighter Wlodzimierz Kapiec told TVN24 that the death toll could rise.
BBC: Poland: Train passenger killed in derailment
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The incident bore similarities with the daubing of a Mark Rothko mural in London's Tate Modern gallery last October, for which Polish national Wlodzimierz Umaniec, 26, was subsequently jailed.