No serious injuries are reported following a multiple vehicle crash on Interstate 81 in Susquehanna County early July 30.

Kathy Whyte/ WNBF News

Pennsylvania State Police say a tractor trailer, a tow truck and passenger vehicle were involved in the 12:05 a.m. crash in the southbound lanes between Harford and Lenox that backed up traffic for three hours.

Officials have not indicated what the tractor trailer had been carrying.

The investigation into the cause of the crash is continuing.