As Utru was told by the president of the Association of Veterans of the Alfa anti-terror unit, Sergei Goncharov, such a number of victims could have been caused by either a gas explosion or a terrorist attack.. According to him, in schools and technical schools, gas cylinders are located in canteens and laboratories, and a state of emergency is possible only in these parts of the building.. "We are dealing with either malicious hooliganism or a terrorist act," Goncharov said. The version of the operation of an explosive device NAC already considers as the main. It should be noted that the criminal did not have much difficulty in carrying an explosive device into an educational institution, since most likely there was not even a frame with a metal detector in the technical school.. Security measures in educational institutions in the Crimea are very different from those in Moscow or St. Petersburg.