Under-fire Angolan billionaire Dos Santos quits Unitel

Angolan billionaire Isabel dos Santos, who is facing a massive corruption investigation, stepped down from the board of the country's largest mobile phone operator Unitel on Tuesday, citing a "climate of permanent conflict" among administrators.Described by Forbes magazine as the wealthiest woman in Africa, she is accused of diverting billions of dollars from state companies during her father Jose Eduardo dos Santos's nearly 40-year rule of the oil-rich southern African nation."After 20 years de