The representatives of special services of Russia informed "Interfax" news agency that a combined charge, which included plastic explosives, was used in the explosive device which went off under the train.

  The bomb was equipped with a mechanical decelerator of explosion on the basis of a regular detonator of manual hand grenade UZRGM. Time of operation of a detonator of this type is from 3,2 to 4,2 seconds. Because of high speed of movement of train, the explosion occurred after passage of the locomotive of a laying point of an explosive.

  Russian experts assert that the composition of explosive consisted of plastic explosives, TNT and ammonium nitrate. The device went off, most likely, with the help of cord, stretched over the rails, - the locomotive, hooking the cord, pulled out with its help the ring from the detonator, and then an explosion occurred.

  The second explosive device, planted near the scene of the first explosion, did not work at full capacity because of the "umbrella" - the generator of a radio noise turned on by special services in the area of sabotage.

  As previously reported, the explosion occurred when the scene was inspected by the ringleader of "Investigation Committee" Alexander Bastrykin. According to one of the versions, the bomb was dampened, so the explosion was not as powerful as the first one and Bastrykin survived.

  The first explosion occurred on November 27 at 21:48 at the 284-th km of the Octyabrskaya railway on a stage of Aleshkino-Uglovka. The power of explosion, according to the FSB, was equivalent to 7 kg of TNT, forming a crater diameter of 1 meter to 1.5 meters and depth of 70 cm, two cars were overturned as a result.

  Note that senior officials of Putin are among those killed in the sabotage of the "Nevsky Express".

  Among the most important is the chairman of the state company "Russian Automobile Roads" and former vice-governor of St. Petersburg Sergey Tarasov, and the Head of State Reserves Agency Boris Evstratikov.

  The train "Nevsky Express" is considered to be an elite one which was used by the Russia's important bureaucrats, businessmen and wealthy Muscovites including residents of St. Petersburg.