Mexican authorities uncover sophisticated cross-border tunnel near San Diego

Video shows investigators moving through an underground tunnel equipped with lighting, ventilation and a transport system that authorities say may connect Tijuana to San Diego. (Fiscalía General de la República via Facebook)

Video released by Mexico's Attorney General's Office shows investigators moving through an underground tunnel equipped with lighting, ventilation and a transport system that authorities say may connect Tijuana to San Diego. (Fiscalía General de la República via Facebook)