WEST READING, Pa. (AP) — An explosion at a chocolate factory in Pennsylvania on Friday killed three people and left five people missing, authorities said. One person was pulled alive from the rubble overnight.

Rescue crews using dogs and imaging equipment continued to search through the rubble Saturday — hours after the blast that erupted just before 5 p.m. Friday at the R.M. Palmer Co. plant in the borough of West Reading, about 60 miles (96 kilometers) northwest of Philadelphia.

The Berks County Medical Examiner and Coroner on Saturday night confirmed three fatalities. The Pennsylvania Emerg...