This attack was classified as the most violent and bloodiest in the history of Monterrey and of the whole state of Nuevo Leon. After the gunmen descended from their vehicles, they quietly stormed the casino's main entrance, opened fire at a few gamblers and guests, and then doused the casino entrances with gasoline and started a fire that trapped the people inside. Surveillance videos show how four vehicles with several well-armed gunmen arrived at the entrance of Casino Royale. This attack was planned and carried out by the most violent drug cartel in Mexico, Los Zetas. Although the government crackdown of the drug cartels dates back to 2006, Monterrey became an increasingly violent city in 2010, due to the rupture of the Gulf Cartel and Los Zetas. Media reports said the majority of those killed were women. In addition, this terrorist attack left over a dozen injured, and over 35 trapped for several hours before the Mexican forces arrived at the place a few minutes after the incident.

Government sources revealed that 52 people were killed, but local reviews mention that 61 bodies were eventually found after a few days. The 2011 Monterrey casino attack was a narcoterrorist attack that took place in city of Monterrey, Nuevo Leon, in the country of Mexico, on August 25, 2011.

Tragedia en el casino royale