The head of Russia's domestic intelligence service has said that a bomb was behind the derailment of an express train overnight that left scores dead and nearly 100 injured.
A second, less powerful bomb has exploded at the site although no one was injured.
Russian Railways chief Vladimir Yakunin said the bomb went off at 2pm (11am Irish time).
FSB chief Alexander Bortnikov has told Russian President Dmitry Medvedev that a bomb equivalent to 7kgs of TNT had derailed the train late on Friday.
At least 39 people have been killed and 87 others injured in the crash.
The authorities said four rear cars of an express train from Moscow to St Petersburg went off the tracks in the Novgorod province.
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