According to the Washington County Sheriff's Office it happened in Williamsport near Route 63 when a police officer was conducting a traffic stop.
The police have been searching for the individual since this about 3:00 p.m., officials say.
As of 5:00 p.m. the Washington County Sheriff's office released a description of the man. He is a white male, around 5' 9", thin build. He was driving a 2010 international box truck.