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 . The attack in Juarez was reminiscent of an incident in January , when drug cartel gunmen stormed a house party and killed 15 people . 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 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 .