Gunmen stormed a jiggle joint in the northern Mexican city of Monterrey, the wealthy capital of Nuevo Leon state, and killed nine including club employees as reported by The Guardian: "authorities are investigating motives behind the attack, but say a recent upsurge in violence is a result of fighting between the Zetas and the Gulf cartels."
The drug cartels increasingly have expanded their rackets to become fully-diversified organized crime groups, and extortion, robbery, prostitution and other crimes supplement their earnings.
Last year Los Zetas set fire to the Casino Royale in Monterrey in a suspected shakedown against the establishment which resulted in the deaths of 52 patrons.
