This story has been updated.
State Police are seeking the public's help in locating a Northern Westchester teen who is missing.
Andrew Porter-Jackson of Cortlandt, 15, was last seen in the Verplanck area on Thursday, Aug. 3.
Porter-Jackson, believed to be a runaway, is described as being 5-foot-10 and 150 pounds and was last seen wearing dark colored clothing.
The teen has been known to frequent Verplanck, New Rochelle, and Ellenville.
Troopers have checked numerous locations attempting to locate him.
Anyone with information on his whereabouts is asked to contact the New York State Police by calling (914) 769-2600 or (914) 737-7171.
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