Police have arrested three persons for allegedly beating a micro-bus helper black and blue at Lokanthali. Officials said the trio, including Raj Kumar Singh, the prime accused, had assaulted Babukaji Shrestha, 27, the micro-bus helper over a dispute on travel fair. Shrestha has suffered injuries in different parts of the body and is undergoing treatment at Thimi based Madhyapur Hospital. Further investigation into the case is under way.