Gunmen killed a woman and her lover after they were discovered having sex in a field near a tribal village in southern Pakistan, police said on Monday. Three men opened fire on the victims after spotting them in an "objectionable condition" in the field before dawn on Sunday near Mewa Khan Sunhari village, about 550 kilometres northeast of Karachi, said area police official Abdul Majeed Abro. The 33-year-old man, identified as Hadi Bakhsh Buledi, and the 25-year-old woman, identified by the single name Raji, died at the scene of the shooting, Abro said. Both had been married to other people."This is a case of karo-kari," Abro said, referring to an ancient custom of killing adulterers. Police were looking for the three suspected attackers and Raji's husband in connection with the killings, Abro said.