Attempt of oil pipeline undermining is prevented by policemen in Chechnya. The incident took place at Tersky pass, in Groznyy rural district. Officials of guarding service found self-made explosive assembly during the beat. In the view of threat of remote control undermining policemen neutralized the bomb by own forces at safe distance. Shell-hole with diameter of 2 meters has formed at the place of the explosion. Operative-search group investigates the case. Metal fragments used in self-made explosive assembly have been revealed. Measures for establishment and arrest of persons responsible for this act of sabotage are taken.