POTTSVILLE, Pa.—A Pennsylvania county coroner said Monday at least three people died in a collision involving more than 50 vehicles that closed a portion of an interstate and sent more than a dozen people to area hospitals. Dr. David J. Moylan, the Schuylkill County coroner, said the search of the scene hasn’t been completed because of the burning vehicles, but “I suspect it could run higher.” The crash in northeast Pennsylvania happened around 10:30 a.m. and John Blickley, the deputy emergency management coordinator for the agency, said officials believe a snow squall clouded visibility and likely contributed to the accident. Blickley said three tractor trailers carrying unknown cargo were on fire when emergency personnel responded. Smaller fires broke out out in other vehicles as well but all had been largely brought under control, he said. Many fire units were at the scene, including a number or tankers coming to replenish …