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A crater has been found near the track, raising suspicions that a bomb may have been used to derail the train.
Moscow, Russia (CNN) -- Investigators probing the derailment of an express train in Russia have found "elements of an explosive device" at the site and believe an act of terror caused the deadly incident.
The derailment killed at least 26 people and injured about 100, but there was no immediate word on who or what group might have been behind the action.
"One can say with certainty that that was indeed an act of terror," Vladimir Markin, spokesman for the investigative committee of the Russian prosecutor's office, told CNN.
A second bomb has gone off at the site where an explosive earlier sent a luxury express train careering off the tracks in Russia killing dozens of people.The less powerful bomb is not thought to have injured anyone, the head of Russia's state railway operator said.
The train was originally derailed by a bomb equivalent to 7kg (15lb) of TNT, the head of Russia's domestic intelligence service told Russian President Dmitry Medvedev.
Russia's Health Minister Tatyana Golikova has said 39 people have been killed, 18 are missing and more than 90 are being treated in hospital. But death toll is still unclear.