JOHANNESBURG - A search-and-rescue mission is under way at an ArcelorMittal plant in Vanderbijlpark.
Three workers are missing following an explosion that took place at around 2am on Wednesday morning.
Management of the plant has issued a statement confirming the collapse and saying they are in the progress of attempting a search-and-rescue operation.
Numsa spokesperson Phakamile Hlubi-Majola said the union is concerned the management of the plant is not doing enough for the missing employees.
"Our problem is that [while] there is a search-and-rescue operation under way, it's an operation where they are depending on ordinary workers to do the rescuing.
"Workers decided to volunteer themselves because management, in their view, was not doing enough. What is needed here is external support," she said.
"The problem is that this building has collapsed on top of another building and the area is very unstable."