Another serviceman, injured as a result of explosion on the territory of battalion "Vostok" location in Chechen district centre Kurchaloy, died of the received wounds in hospital. Thus, total casualties number has achieved 13 people. This information was revealed by Military Prosecutor`s office on North Caucasus Mikhail Renskov. He underlined, that at the place of explosion examination two gas-cylinders had been withdrawn. One of the cylinders bottom was pressed out, said Renskov. According to his words, joint investigation group consisting of specialists of Military and Civil Prosecutor`s offices and specialists of special services has been established. Renskov also added that "version of natural gas explosion is considered as main version, but terrorists attack is also possible".