Cyril Ramaphosa and former African Union Commission chairperson Nkosazana Dlamini-Zuma will address separate rallies in the North West this weekend.
Four men were arrested in connection with the kidnapping of an 80-year-old man in Mahikeng, police said on Tuesday.
Preliminary investigations revealed that Lebogang Serei, one of the accused and the deceased's stepson, was allegedly behind her murder.
The case against the 14 men accused of hacking a man to death in Marikana was postponed to July 18, as no stenographer was available.
The ANC called on the North West SABC to speedily conduct an investigation on the allegations to allow closure to the matter
North West premier Supra Mahumapelo has suspended relations with the SABC, after allegations that he disturbed the broadcaster's editorial policy.
Premier Supra Mahumapelo fired Madoda Sambatha, saying that it was based on allegations that he was selling government land illegally in Mahikeng.
Police spokesperson Brigadier Sabata Mokgwabone said the man was arrested on Saturday in Soshanguve, north of Pretoria.