Police are investigating the incident, which is being linked to unrest in Ethiopia.
Popular Oromo musician Hachalu Hundessa was shot dead on Monday night, sparking widespread unrest.
Some 350 elephant carcasses have been spotted in Botswana's Okavango Delta since May.
South Africa's province Gauteng has become the epicentre of coronavirus cases in the country.
Some 3,000 people were stuck in no-man's land for more than a month after fleeing violence in DR Congo.