Authorities say a 17-year-old boy who went missing for nearly four days before he returned to his Northern California home told his family he hid on his high school campus, surviving on fruit from trees and drinking from the water fountain.

The San Francisco Chronicle reports (http://bit.ly/1QuLiLL) the boy went to his first-period class Monday morning and missed his remaining classes. His disappearance led law enforcement officers to search his school, shopping centers and local parks. They also contacted hospitals in the area.

The teen's parents said in a statement that their son came home during dinnertime Thursday. They said the teen "has expressed the deepest sorrow and regret for his actions."

The parents and the Santa Clara County sheriff's officials didn't say why he decided to go into hiding.