The cause of Friday's blast remained under investigation. Crews were carefully going through incinerated property, searching for possible evidence. Authorities warned of smaller controlled explosions Sunday to dispose of hazardous materials. Sources close to the investigation told CBS News on Saturday that the area "appears to be much more unstable than they thought," which was slowing down the assessment of the site.
"Extraordinary precautions are in place to prevent further damage and injuries," the Humphreys County sheriff's office said in a statement. "The community around the area is safe but you may hear noise and see some smoke."
The initial blast was felt for more than 20 miles, leaving a smoldering wreck of twisted and charred metal and burned-out vehicles at the plant. Authorities said there were no survivors. They had not identified the deceased by Sunday.
CBS affiliate WTVF-TV in Nashville broadcast
video of debris strewn about the site, with damaged vehicles in a parking lot.
The plant is located in a heavily wooded area of middle Tennessee, between the vital Tennessee River to the west and Nashville to the east. Accurate Energetic Systems specializes in the development and storage of products and explosives for military, aerospace and commercial demolition markets,
according to their website. The company also tests those explosives on the 1,300-acre campus.