Police said a man in a small green pickup truck with Connecticut plates drove past the woman two times around 10:50 a.m. He then stopped ahead of the runner, got out and took down his pants, police said.
The woman ran in the opposite direction, police said, and did not see the suspect again.
On Aug. 17, Bedford police investigated a public lewdness incident on Reservoir Road involving a similar suspect and vehicle. The area is near the Cross River Dam and is frequented by walkers and joggers.
The victim described the man as being of possible Hispanic or Italian descent, approximately 40 to 50 years old, 5-feet-8 to 5-feet-10, with a thin build, black hair and a mustache.
Anyone with information should contact the Bedford Police at 914-241-3111.
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