Police have taken over security duties from stewards at two World Cup venues after workers staged a protest over pay.
Police will handle security duties at Green Point (Cape Town) and Durban stadiums until further notice, a spokesman for the organising committee said.
A protest by stadium security workers took place in Durban on Sunday following the opening match in the city between Germany and Australia.
Around 500 safety stewards stormed through the Moses Mabhida Stadium three hours after the game, hurling objects at the office of the security manager over a pay dispute.
Members of the Public Order Policing Unit were sent to intervene, before calm was restored in the early hours of Monday morning.
Injuries were reported, but no serious ones.