Correctional Services said that “matters are under control” at Johannesburg’s Sun City Prison on Wed.
Workers in the metal and engineering industry will strike on Monday, the United Association of South Africa (Uasa) said yesterday.
Tim Kruger, a spokesman for the trade union, said: "The metal and engineering industry must brace itself for a crippling strike from Monday, with a possible far-reaching effect on the country's economy."
Kruger said Uasa had been joined by four other trade unions, including Solidarity and the National Union of Metalworkers of South Africa, in declaring notice to strike.
He said Uasa had served its 48-hour notice to strike to about 150 employees on Wednesday.
"This means that our members will embark on strike action as from Monday," said Kruger.
The duration of the strike would depend on continuing negotiations.
Employees want a 10-percent wage increase and a commitment that employee share ownership programmes would be started.
Kruger warned union members to refrain from acts of violence and vandalism during the strike. Uasa is affiliated to the Federation of South African Trade Unions. - Sapa