Zimbabwe's first lady, Grace Mugabe, is due in court in South Africa following reports of an alleged assault, South Africa's police minister says.
Fikile Mbalula said: "She's not under arrest because she co-operated and handed herself over to the police."
She is alleged to have attacked a young woman at a Johannesburg area hotel.
The woman, 20, accused Mrs Mugabe, 52, of hitting her in the face and put images of a head wound on social media. Mrs Mugabe has not yet commented.
South African police confirmed that the 20-year-old had registered a case of assault with intent to do grievous bodily harm.
Mrs Mugabe allegedly attacked the woman with an extension cord after finding her with her two sons in a hotel room in Sandton, a plush suburb north of Johannesburg, reports the BBC Pumza Fihlani.
The attack is said to have happened on Sunday evening.
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Zimbabwe Information Minister Christopher Mushowe told the BBC that he was unaware of the allegation.
Mrs Mugabe was in South Africa to be treated for an ankle injury, sustained during a road accident last month, when the alleged assault took place, according to Zimbabwean media.
It is not clear whether she was travelling on a diplomatic or a normal passport.