** UPDATE **
Accordng to Pennsylvania State Police, the trooper who was shot was conscious and alert before undergoing surgery.
Another trooper at the scene is being treated for a possible broken leg, sustained while seeking cover from the gunfire. The gunman remains barricaded. Additional PSP resources are onsite.
Montoursville - According to the Troop F PSP Facebook page, Patrol members attempted to conduct a welfare check on Barney Hill Road in Nelson Township, Tioga County at approximately 12:30 p.m. today when the subject of the welfare check opened fire at the troopers.
One trooper was struck and has been transported by helicopter to receive medical attention. His condition is unknown at this time.
This is an ongoing situation, please avoid the area. More information will be provided when it is available.