Four persons were killed an ugly string of group clash in Barak Valley on Wednesday. Twenty others have been 20 injured in the clash. According to police, the clash took place over a five year long land dispute. The two groups used sharp weapons during the clash at Matijuri area of Hailakandi district. The deceased were identified as Mizanur Rahman Chaudhary, Nazimuddin Chaudhary, Nazrul Haq Barbhuiyan and Aziruddin Barbhuiyan.