NTSB investigates deadly chocolate factory explosion and combustion risks.

The National Transportation Safety Board has opened a safety investigation into the natural gas explosion and fire at R.M. Palmer candy factory in West Reading, which killed seven workers. The cause of the explosion is still unknown, and investigations are being carried out by Pennsylvania State Police and UGI. The community is offering support to the families of the victims, and a disaster declaration has been extended to provide access to important resources. Some workers had complained about smelling gas before the explosion, but the supervisors had assured them that it was being handled.