Armed men gunned down two real brothers over old enmity here on Tuesday and fled the scene. According to police, gunmen opened fire at two real brothers hailing from rival group in Chak 222 of Bahawalnagar killing them on the spot and fled the scene. The police moved the bodies to hospital where they were handed over to heirs after post mortem. The heirs of the deceased held protest demonstration against the incident and demanded to bring the culprits to book.