Durham, N.C. — A 40-year-old missing Durham man with a cognitive impairment is the subject of a Silver Alert issued late Saturday.

David Melo Barreira was reported missing from 4 Kimbrough Court. He is white, 5 feet 7 inches tall, and weighs 225 pounds. He has short, black hair and brown eyes.

Barreira was last seen wearing a gray pullover, blue jeans, white Nike shoes and black hat.

It's unknown where he might be headed.

Anyone with information on Barreira's whereabouts is asked to call Durham police at 919-560-4600.

Developed in 2007, the Silver Alert system quickly notifies the public about missing endangered people who suffer from dementia or other cognitive impairments, such as Alzheimer's disease.

It also allows caregivers and nursing homes to report a person missing. In the past, only a family member could report an adult missing.