Six servicemen died and twelve were injured in the explosion at a training range in the Astrakhan region, Russian Itar-Tass news agency reported Tuesday. A regional police source told that the explosion happened in the disposal of old munitions. Six servicemen died instantly. Twelve were injured. Causes of the accident are so far unknown. There is a theory that the explosion might have happened by neglect of safety rules," he said adding, "According to the preliminary information, the explosion did not spark a fire. There is no danger to local population."