A farmer was killed and his wife assaulted on their farm outside Ventersdorp on Sunday morning, North West police said.
Two men confronted the 67-year-old farmer outside his house on the farm Sterkstroom shortly before 10am, Brigadier Thulani Ngubane said.
They hit him over the head and dragged him into the house. They found his 64-year-old wife and attacked her. It was believed that they also raped her.
The men tied her up and fled with two cellphones. She managed to free herself and found help on a neighbouring farm. The farmer died on the scene. His wife was recovering in hospital in Klerksdorp.
Police suspect the motive for the attack was robbery. The assailants were still at large.
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