CUMBERLAND COUNTY, Pa. (WHP) — Traffic is at a standstill on I-81 North on Friday morning after a tractor-trailer rolled over.

All lanes are closed between Exit 52B (Middlesex) and Exit 57 (Mechanicsburg), according to PennDOT.

The crash occurred around 5 a.m., and the roadway is expected to reopen around 7 a.m., PennDOT said.

It’s unclear how many vehicles may have been involved in the crash or if any injuries were reported.

Pennsylvania State Police are investigating.