Latest: Family of model accusing Mugabe wife of assault 'were offered money to drop claim'

Update 7.09pm: Lawyers for the young model who claims Zimbabwe's first lady Grace Mugabe assaulted her in a Johannesburg hotel have said that her family has been approached with an offer of money to drop the allegation.

The lawyers threatened to go to court if South Africa's government grants that immunity, saying it cannot be used to "escape prosecution from grave crimes".