A bomb blast caused a Russian express train with nearly 700 people on board to derail, ******* at least 26 people, intelligence officials say.
The Nevsky Express derailed in remote countryside on Friday night while travelling between the capital Moscow and the second city, St Petersburg.
Russian investigators found "elements of an explosive device" at the scene, an official statement said.
A senior intelligence official said a bomb had derailed the locomotive.
Alexander Bortnikov, head of Russia's domestic intelligence service,
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told Russian President Dmitry Medvedev that a bomb equivalent to seven kilos (15 lb) of TNT had been detonated, Reuters reported.
There was no immediate confirmed claim of responsibility for the ******.
The train was travelling on one of Russia's busiest rail routes and Friday evening is peak travel time
