Officials say West Penn Township Sergeant Melissa Ruch was driving along Route 309 when she saw a car on the side of the road.
She pulled over and as she approached that car a man grabbed her and threw her over the guard rail.
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Ruch tumbled more than 35 feet.
By the time help arrived, the man had driven away.
Rescue crews retrieved her using a Stokes basket.
Ruch was flown to a Lehigh Valley hospital.
Her injuries are not considered life threatening.