SIBI: Three people were killed when two tribal groups clashed over land dispute in Lehri area near here Thursday. According to details two groups of Brahmani clan of Domki tribe clashed over land dispute in Lehri area. They took positions in trenches and started firing against each other. As a result three persons Gul Jan, Ghulam Rasool and an unknown died in the firing. There are also reports of injuries to several others. Local administration reached the site and started efforts for a ceasefire. Firing was continuing when last reports came in.