Officials said the accused trooper Chandra Shekhar, who was arrested in Chandigarh yesterday, took the police to the Murray pump house area in the hill station area where he had hidden the Light Machine Gun (LMG) and around 100 rounds of ammunition.
"The weapon is suspected to have been used by Shekhar to kill his officer and injure others on July 10," a senior official said.
He is accused of killing his officer Subedar Surendra Lal and injuring another colleague who is recuperating at a hospital in Dehradun.
Following the incident, the Indo-Tibetan Border Police (ITBP) had decided to replace the unit guarding the academy with immediate effect.