Philadelphia Refinery Explosion Prompts Safety Probes

Federal safety investigators and workplace safety regulators will investigate a Philadelphia oil refinery that caught fire and exploded early June 21.

The U.S. Chemical Safety and Hazard Investigation Board is sending a four-person team to Philadelphia to begin investigating the refinery, said spokeswoman Hillary Cohen.

No injuries have been reported at the Philadelphia Energy Solutions oil refinery, an Occupational Safety and Health Administration spokeswoman said in an email. OSHA is investigating if worker safety regulations were violated, the spokeswoman said.

The refinery caught fire and exploded at about 4 a.m., local authorities said at a press conference.

The explosion is ...