Lawsuit alleges chocolate factory ignored warning before fatal explosion.

The family of a worker who died in an explosion at a chocolate factory in Pennsylvania has filed a wrongful death suit against R.M. Palmer Co., alleging that the company ignored warnings of a natural gas leak. The lawsuit also names gas utility UGI. The explosion killed seven workers and injured several others. The cause of the explosion is still under investigation, but federal safety officials have confirmed that they are studying the role of a natural gas pipeline.