Johannesburg - Two more houses of non-striking Transnet workers were damaged on Saturday in Motherwell, in the Eastern Cape, the company said.
The houses were stoned in the early hours of Saturday morning, spokesman Mboniso Sigonyela said.
On Thursday, two houses were stoned in the same area. The houses were those of Transnet employees at the Ngqura Container terminal.
Sigonyela said two cars were petrol-bombed on Friday morning.
“The latest incidents take the number of such attacks to 30 since the union (Numsa) vowed to intensify its action against the company three days ago.”
The National Union of Metalworkers of SA (Numsa) has been on strike at the terminal over transport allowances, working hours for particular tasks, and the use of labour brokers.
Sigonyela said the Labour Court had on Friday ordered the union and its members to stop the violence and intimidation targeted at non-striking workers.
The court had ordered the striking workers to stop causing damage to property, vehicles or buildings of Transnet and its employees.
They were to also stop encouraging any person to commit an act of violence, he said.
Numsa was not immediately available for comment.