Mike Wright, director of health, safety and environment with the United Steelworker’s Union in Pittsburgh, Pennsylvania, said the local union and the company are conducting the first stage of the investigation into Friday’s incident.
“ The first phase … is looking at the bare facts of what happened,” Wright said. But in subsequent days and weeks, investigators examine underlying causes, he said.
A representative from the international union was on the way to the plant Friday, Wright said, but four deaths in four separate accidents at the same plant is not normal.

