David Abel (pictured), 57, was last seen board bus No. 54 in the area of Power Inn and Gerber roads about 11 a.m. He is considered to be at risk due to mental health disorders and a serious medical condition, according to a Sheriff's Department news release.
Abel is described as 5 feet 9 inches tall and weighing approximately 210 pounds. He has short gray hair and brown eyes, and is missing his front teeth.
Abel was last seen wearing a light-blue shirt, dark-blue sweatpants, a dark-blue baseball cap and carrying a blue duffel bag. He has limited mobility and is known to use public transportation.
Anyone with information regarding Abel's whereabouts is asked to call the Sheriff's Department at (916) 874-5115.