SANKHUWASABHA: An unidentified group torched the office of Bhotkhola Rural Municipality in Sankhuwasabha district on Friday night. All documents and furniture of the office building were destroyed in the arson, said police. An improvised explosive device was also recovered from the premises of the rural municipality office. The incident site is about 95 km far from Khandbari, the district headquarters of Sankhuwasabha. (PR)