BARKHAN: A brother killed his younger brother over petty dispute here Sunday and escaped. According to details Muhammad Sadiq asked his younger brother Muhammad Abdullah 12 not to go for picnic who sought his permission for it. They exchanged hot words and Sadiq opened fire on Abdullah who sustained serious injuries. He was referred to D G Khan. While on way he succumbed to his injuries at Sakhi Sarwar. Sadiq escaped from the scene.