Search on for 4 people missing in deadly chocolate factory explosion

WEST READING, Pa. (WHTM) -- An explosion at a chocolate factory in Pennsylvania on Friday killed three people and left four 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 northwest of Philadelphia. Officials: 2 dead, 5 m