To contain the spread of the Covid-19 pandemic, South Africa's President Cyril Ramaphosa closed borders at 35 of 53 land entry points.
"This measure will not be effective without a physical barrier. Although there are inspectors at each border point, the health status of migrants arriving in the country illegally is not known," he said.
South Africa, the most industrialized country on the African continent, has reported more than 202 Covid-19 positive cases. So far, it has not recorded any deaths.