The dispute over the plot had been going on for over five years and the two groups used swords and other sharp weapons during the clash, which took place at Matijuri area of Hailakandi district, police said.
The dead persons have been identified as Mizanur Rahman Chaudhary (65), Nazimuddin Chaudhary (30), Nazrul Haq Barbhuiyan (35) and Aziruddin Barbhuiyan (40), they said.
Additional police forces have been deployed in the area and search is on for the culprits, they said.
The situation in the area is tense but under control, the police added.
