TIJUANA, Mexico (AFP) - Police shot dead 19 prisoners in the second riot in three days at a Mexican prison in Tijuana near the US border, a state official said Thursday. The prisoners were shot as police stormed the prison to regain control during the five-hour riot, Daniel de la Rosa Anaya, public safety chief for the northwestern state of Baja California, told reporters. "When the inside of the jail was inspected after the rioting, 19 bodies were counted," he said, adding that 12 wounded prisoners were receiving medical attention. Some 250 high-risk prisoners, including 200 men and 50 women, had been transferred to prisons elsewhere in the country, he added.