The U.S. Chemical Safety and Hazard Investigation Board also investigated a 2003 blast at the Payne Street facility that killed one worker.

A six-person team will arrive onsite Wednesday to investigate the Givaudan factory explosion that killed two workers.

The family of Kevens Dawson Jr., who died in an explosion at a Louisville manufacturing facility last week, had urged officials to return to the wreckage after initially being told all employees had been accounted for.