UPDATE -- Police say Matthew Rich has been found safe.

WINSTON-SALEM, N.C. -- Winston-Salem Police say a silver alert has been issued for a 15-year-old boy who suffers from cognitive disorders.

Police say Matthew Isaac Rich was last seen Thursday at Parkland High School.

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Matthew is about 5'7 and 125 lbs. He was last seen wearing a blue tee shirt with a Pokemon logo on it, grey and white shorts, and shoes with "emoji" faces on them.

If you have information on Matthew's whereabouts, call the Winston-Salem Police Department at 336-773-7700 or Crime Stoppers at 336-727-2800.

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