Polish prime minister Donald Tusk, second right, visits the site of the rail line in Mika that was damaged by sabotage, near Deblin, Poland. Photograph: KPRM/APPoland has identified two people responsible for an explosion on a railway route to Ukraine, prime minister Donald Tusk said on Tuesday, adding that they were Ukrainians who collaborated with Russian intelligence and that they had fled to Belarus. [ Poland railway blast was ‘unprecedented act of sabotage’, says Donald TuskOpens in new window ]Russia has repeatedly denied being responsible for acts of sabotage and on Tuesday the Kremlin dismissed accusations of involvement. He said that other trains had gone over the affected piece of track before one stopped. In a second incident near Pulawy, a steel clamp was installed on the track with the likely aim of derailing the train, Tusk said.
