Eight police officers in Ciudad Juarez , Mexico , have been killed in recent weeks . Authorities say cartels are responsible for killings . Comment: Journalist Edgar Roman in Ciudad Juarez contributed to this report . The chief -- a former military officer -- says he 's not stepping down .
Eight police officers in Ciudad Juarez , Mexico , have been killed in recent weeks . Authorities say cartels are responsible for killings . Comment: The chief -- a former military officer -- says he 's not stepping down .