NEW : The attack is similar to previous killings at drug rehab centers . Victims in Tijuana have ranged in age from 19 to 56 years old . The men opened fire inside a rehab center , not in a vehicle , state - run news agency reports . Sunday night 's killings in Tijuana came one day after 14 people were killed at a Juarez party .
NEW : The attack is similar to previous killings at drug rehab centers . Victims in Tijuana shootings ranged in age from 19 to 56 years old . Four men opened fire inside a rehab center , fled in a vehicle , state-run news agency reports . Sunday night 's killings in Tijuana came one day after 14 people were killed at a Juarez party .