"Tragedy Strikes Pennsylvania Chocolate Factory in Deadly Explosion"

Investigators are struggling to identify the cause of a deadly explosion that destroyed part of a Pennsylvania chocolate factory, killing seven people and injuring several others. The jumbled wreckage is making it difficult to determine the cause of the blast, which could have been caused by natural gas or flammable dust produced by ingredients like cocoa powder and corn starch. The US Occupational Safety and Health Administration is investigating the incident, and records show only one violation at the plant over the past five years.