MONTELLO, Wis. -

Authorities are searching for a Marquette County teen Saturday they consider missing and endangered.

The Marquette County Sheriff's Office said 18-year-old Damian D. Berg was last seen Thursday at about 10:20 p.m. near County Road D west of Packwaukee.

Berg has attention deficit disorder and may appear confused and unable to focus when spoken to, according to an alert.

Berg was last seen wearing white or gray reversible shorts. He was not wearing shoes or a shirt, the alert noted.

Berg is white, 6 feet tall, weighs 147 pounds, and has brown eyes and brown hair.

Officials said Berg is dependent on his parents and left his glasses and medications at home.

Deputies continued to interview residents in the area Saturday after a ground and air search of several miles near Berg's home for the teen had ended by early afternoon.

Anyone with information on Berg's whereabouts is asked to call the department at 608-297-2115.