WATCH: Protesters bulldoze police vans at Richards Bay harbour

Protesting workers caused havoc at Richards Bay Harbour in KwaZulu-Natal on Tuesday‚ using bulldozers to flip over police vans.

Police fired warning shots to control the crowd as workers went on the rampage.

KwaZulu-Natal police spokesman Lieutenant-Colonel Thulani Zwane said some of the workers were arrested in connection with the incident. Police are monitoring the situation.

The protest turned violent at the main entrance to the port‚ resulting in all work coming to a standstill. People were advised to stay away from the area.

Transnet officials were not immediately available for comment.