A collision involving more than 40 vehicles closed a portion of Interstate 81 in Pennsylvania and sent more than a dozen people to area hospitals on Monday, according to the Schuylkill County Office of Emergency Management. 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. About 40 vehicles including multiple tractor-trailers were involved in the initial crash, he said. READ MORE: https://6abc.com/pennsylvania-highway-crash-video-interstate-81-i-81-pileup-truck/11687690/