Authorities sought the public’s help Monday in finding an at-risk 20-year-old man who went missing after last being seen riding a bicycle in Rosemead.

David Garcia was last seen around 7 p.m. Sunday near the intersection of Rush Street and Walnut Grove Avenue, according to the Los Angeles County Sheriff’s Department.

Garcia is described as Hispanic, 5 feet, 6 inches tall, 180 pounds, with brown hair, brown eyes and a mustache, last seen wearing a white T-shirt and black pants.

He has autism, and Garcia’s family is concerned for his safety, the department stated.

Anyone with information regarding Garcia’s whereabouts was urged to call the Homicide Bureau at 323-890-5500 or Crime Stoppers at 800-222-8477.