22-year-old driver falls asleep, causing crash on Howard Avenue in San Ysidro, seriously injuring passenger with fractured thoracic vertebrae; police rule out DUI.

22-year-old driver falls asleep at the wheel, causing crash on Howard Avenue in San Ysidro, seriously injuring a passenger with fractured thoracic vertebrae. Police ruled out DUI as a factor; further investigation ongoing. San Diego Police Department and Crime Stoppers seek information about the accident.