WILDOMAR (CBSLA.com) — The search continued Thursday for a teenager with special needs who disappeared from his high school in Riverside County.

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David Soto, 18, was last seen walking off the Elsinore High School campus at 21800 Canyon Dr. around 8:45 a.m. Tuesday, according to officials.

Soto has autism, a diminished mental capacity and also suffers from schizophrenia, Riverside County Sheriff’s Department said.

The brother of the missing teen, Frank Ontiveras, told KCAL9’s Tom Wait he fears his sibling may have run out of his medication.

“That is a concern, you know, of him out there with no food or water, it’s always a concern. He takes medication for his illness and stuff like that, on a regular, consistent basis,” Ontiveras said.

Soto’s mother said the teen is “fascinated by the foothills”, where authorities have set up a command station and centered their search.

A police dog picked up Soto’s scent but lost it.

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Soto is described as six feet tall, weighing 130 pounds, with brown hair and brown eyes. He was last seen wearing a long-sleeved yellow Lakers hooded sweatshirt, blue jeans, black tennis shoes and black rim glasses.

Soto’s family says he has disappeared in the past but has always been located.

Anyone with information about Soto’s whereabouts was asked to call Lt. Zach Hall at (951) 445-7951.

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