A South African holds a sign as she stands on the side od a road in Sandton, as xenophobic violence continued, on April 18, 2015. South African police detained more than 30 people overnight as xenophobic violence simmered around the economic hub Johannesburg, officials said. AFP PHOTO/MUJAHID SAFODIEN        (Photo credit should read MUJAHID SAFODIEN/AFP/Getty Images)