Thick smoke billows from the Casino Royale as firefighters attack the fire, in Monterrey, Mexico on August 25, 2011. 23 people were killed and 10 more were injured on Thursday as a result of an attack with at least an explosive device at the casino. Journalistic reports indicate that several casinos in Monterrey have been attacked --the last, last May-- because their owners have refused to pay extortion, another source of income for the drug traffickers. Nuevo Leon is one of the scenarios most affected by the clashes between drug traffickers and the security forces which have left a balance of more than 41,000 killed since December 2006, when the government launched a strategy to combat them with the participation of the army. AFP PHOTO/Dario Leon