A man and his four sons were killed by their rivals at early hours of Friday at Ruma upazila in Bandarban district.
The deceased were Lockrui Mro, 70, the head of Abu Para, his sons Rontui Mro, 35, Rengri Mro, 30, Menwai Mro, 25 and Ringrao Mro, 20. They were the residents of the Abu Para under Galenga Union.
A long standing dispute between the family and some neighbours led to the murder, police said quoting locals.
As a sequel to that, the neighbours, equipped with lethal weapons, attacked Longrui Mro's family at early hours, leaving him and his elder son dead on the spot.
The rest succumbed to their injuries on way to hospital.
Ruma Police Station officer in-charge Md Abdul Kashem confirmed the incident.