At least four people including a couple and minor girl were killed in exchange of fire over marriage feud here in Mardan on Sunday. According to police two groups residing in Lound Khorr locality of tehsil Takht Bhai of Mardan traded fire after first group broke the engagement of their girl arranged with a boy of second group since early childhood. Armed men of first group opened fire at members of second group in which a couple and a minor girl were killed and in retaliatory fire an attacker was also killed. The police reached the scene and brought the situation under control. A case has been registered into the incident and police have arrested several people from both sides for investigation.