Los Zetas appears to have left a message for rival gang Caballeros Templarios, or Knights Templar, in the form of vandalism of a temple in Michoacan state, Mexico. (Associated Press)

Los Zetas appears to have left a message for rival gang Caballeros Templarios, or Knights Templar, in the form of vandalism of a temple in Michoacan state, Mexico. (Associated Press)