Kalyan: A 57-year-old man and his two sons were arrested for allegedly beating up a Railway Protection Force (RPF) constable when he tried to intervene in a dispute involving commuters, a police official said on Friday.The incident took place on Thursday afternoon at Kalyan station in Thane district, he added.“The RPF constable, who was on duty, was approached by a passenger who claimed assault by a group. When he reached the spot to investigate, Abdulmani Kallu Sheikh (57) and his sons Salman Abdulmani Sheikh (21) and Sarkar Abdulmani Sheikh (36) assaulted him,” the railway police official said.Those in the vicinity pinned down the three attackers and rescued the RPF personnel, who has been hospitalised, he said.The three were arrested under Bharatiya Nyaya Sanhita provisions for causing hurt to a public servant and other offences, the Kalyan railway police station official said.

