About 500 people blocked a road with burning tyres near Cape Town International Airport on Friday morning, the city's disaster risk management centre said.
Spokesperson Wilfred Solomons-Johannes said people started gathering from 4am on the N2 highway, throwing stones at passing vehicles.
He said police fired rubber bullets to disperse the crowd.
The highway was closed in both directions, between the Mew Way and Duynefontein offramps.
Motorists were being diverted onto the R300.
The police were not immediately available for comment.
Two Roodepoort students allegedly partially skinned a 12-week-old kitten while it was still alive.
"Madiba is a fighter and at his age as long as he is fighting, he'll be fine," Mac Maharaj said.
Ten people have been arrested after 29 kidnap victims were found in a house near Johannesburg.
