An unidentified group has vandalized the Annapurna post office yesterday in the evening. According to the security guard, at around 9:30 pm in the evening yesterday a group of around 4 to 5 men threw stones at the office and ran away. Police officer Dan Bahadur Karki said that they are investigating the case and are searching for the culprit. since the group has threatened to attack the office again police have been providing security in the office premises of Annapurna Post.