An unidentified person has attacked an assistant constable of APF who was on duty in Gaddha revenue checkpoint in Kanchanpur on Friday night. According to the police, the assistant constable was attacked with a sharp weapon on the neck from behind, while he was patrolling at around 8:30 pm in the evening. He has been sent to Kohalpur medical college for treatment. Police inspector, Surendra Shahi of the police station at Gaddha said that they are looking for the attacker.