johannesburg violent feud south african meter taxi drivers ride-hailing service uber taxify escalate another three vehicles torch use petrol bomb police say thursday drivers uber uber.ul estonian start-up taxify operate johannesburg capital pretoria face threats protest regular taxi operators accuse app-based drivers poach customers cheap fare one uber vehicle two taxis torch last week upmarket sandton district wednesday three taxify vehicles set alight pretoria suburb sunnyside police say one incident wednesday taxify driver respond pick-up request corner group eight men threaten violence arrive location vehicle alight alight another taxify vehicle set fire different location one vehicles burn completely second slight damage say police captain daniel mavimbela mavimbela say identity suspect yet establish 6,000 vehicles use e-hailing uber application find customers south africa service grow swiftly public transport keep rise population sprawl cities three cars torch south african taxi war