As East Rand companies increase security following intimidation by striking metalworker unions, police have been urged to up their patrols in industrial areas.
There were several reports of intimidation, threats and violence by protestors in areas including Germiston, Wadeville, Alrode and Boksburg.
Employees in the steel and engineering sector are demanding a 13 percent pay hike, a ban on labour brokers and other employee benefits.
Germiston police spokesperson Michelle Venter said several cases of malicious damage to property were opened by business owners in the area.
“We are increasing police numbers and we are looking to patrol all the areas that are affected,” said Venter.
A businessman in Boksburg said striking metalworkers went on the rampage on Tuesday.
“One of our vehicles was attacked by the mob, broke two windows and injured the driver’s eye,” he said.
Despite the damning allegations and eyewitness reports, the National Union of Metal Workers of South Africa (Numsa) maintains its members are disciplined and are not causing any trouble.