Updated: 7:12 PM EST Feb 13, 2021 A crash involving two tractor-trailers closed part of Interstate 81 Saturday morning. Pennsylvania State Police say the crash occurred around 2:20 a.m. near mile marker 55 in Cumberland County.The accident investigation and cleanup closed I-81 southbound lanes between the Middlesex and Mechanicsburg exits for more than 9 hours.Pennsylvania State Police in Carlisle are continuing to investigate the cause of the crash.There is no word on any injures at this time. SILVER SPRING TOWNSHIP, Pa. — Silver Spring Community Fire Company Advertisement Pennsylvania State Police say the crash occurred around 2:20 a.m. near mile marker 55 in Cumberland County.