South African borders on alert to ensure Grace Mugabe does not flee

By Ed CropleyJOHANNESBURG (Reuters) - Police have put a "red alert" on South Africa's borders to prevent any attempt by Zimbabwean first lady Grace Mugabe, accused of assaulting a model in a Johannesburg hotel, to flee the country.Mrs Mugabe, 52, has asked for diplomatic immunity in the case, but has not been charged.The alleged victim, 20-year-old model Gabriella Engels, has accused Mugabe of barging into a hotel where Engels was meeting with Mugabe's sons, and whipping her with an electric cor