Gunmen in Pakistan killed five people, three of them Britons of Pakistani origin, over a family feud, police said on Friday. The killings took place near Gujrat on Thursday. Three Britons , identified by Pakistani police as Mohammad Yusuf, his wife Pervez Bibi and their daughter Tania, were visiting the grave of a friend at a cemetery with a relative when gunmen opened fire. "All three Britons , their host and an attacker were killed in a shootout," Ghulam Sarwar, police chief of the area, told Reuters by telephone. The attacker was apparently killed accidently by his one of his fellow gunmen, Sarwar said. Yusuf's son was married to the sister of one of the attackers in Britain 12 years ago but their marriage broke down and led to a separation that caused rivalry between the families, Sarwar said. Lancashire police in northern England said three members of a family from Nelson, a town in northwest England, were killed in the shooting incident.