( CNN ) -- Mexico : Mexico officials say they are not on high alert . Immigration to Nuevo León has been on the rise because of violence . The Zetas drug cartel is planning to target U.S. citizens , officials say . Nuevo León , Mexico is across the border from Laredo , Texas .
Mexico : Mexico officials say they are not on high alert . Immigration to Nuevo León has been on the rise because of violence . The Zetas drug cartel is planning to target U.S. citizens , officials say . Nuevo León , Mexico is across the border from Laredo , Texas .