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ST. LAWRENCE COUNTY, N.Y. -- New York State Police and the DEC continue to search for the 18-year-old who disappeared over the weekend in St. Lawrence County.

Authorities say Colin Gillis was last seen late Saturday night by a passerby, walking down Route 3 in Tupper Lake toward Piercefield.

He is described as 6-foot-1, 170 pounds and was last seen wearing a white shirt with black stripes, blue jeans and red sneakers.

On Wednesday, 17 DEC Forest Rangers along with New York State Police and 120 well-prepared volunteers helped to search some of the last areas within one-mile of where Gillis was last seen. An Aviation Helicopter, Dive Teams, K-9 Units and a DEC Airboat were also used in the search.

For Wednesday, search efforts will focus on Raquette Pond, Piercefield Flow and the Raquette River.

Anyone with information is encouraged to call authorities at (518) 897-1300.