The labour department released a preliminary report into the cause of the Grayston Bridge collapse.
The incident two weeks ago killed two people and injured 19. Three of these were still in a critical condition in hospital this week.
At a media briefing in Tshwane yesterday, chief inspector Tibor Szana said: “The City of Joburg and the Joburg Development Agency appointed Royal HaskoningDHV as an agent. Murray & Roberts was appointed principal contractor and Formscaff was chosen to supply materials. Murray & Roberts was awarded a contract to start construction of the Grayston Drive pedestrian and cyclist structural bridge. They started work on the 29 January and were still continuing when the incident occurred.
“It has come out that at the time of the collapse of the temporary bridge, the installation of the Kwik stage design was not complete, but traffic was already moving under the structure.”
Labour department acting director general Aggy Moiloa said: “We will dig deeper to determine the cause and the law will take its course.”
She said based on the information gathered by the chief inspector, the decision has been made to conduct a formal inquiry.
“The inquiry will focus on the responsibility of the client. We will investigate the responsibility of the principal contractor in terms of construction regulations.
“ We will also investigate the responsibility of the agent on behalf of the client in terms of the same regulations and the supplier of the materials and design,” said Moiloa.