Police took charge of security at Durban's Moses Mabhida stadium Monday, after striking stewards walked out.
Neither FIFA nor Durban police would immediately comment on the situation, although officers on the ground did confirm it to the German Press Agency, dpa.
The matter was likely to grow in importance with the approach of Durban's next match, a Group H encounter between Spain and Switzerland on Wednesday.
In the early hours of Monday, police used rubber bullets and tear gas to break up a demonstration by private security stewards who demanded more pay and refused to leave the stadium.
Stewards who remained on duty left peacefully on Monday afternoon.