

Security personnel regained control of the prison by 6:00 am. A guard was taken hostage during the melee, and mattresses were set on fire. The guards of the prison allowed the Zeta members to surge from Cellblock C into Cellblock D and attack the Gulf Cartel members, who were sleeping. The fight broke out around 2:00 am local time between inmates in one high security cell block and inmates of another security cell block. Some other fugitives were also leaders in the organization. One of the fugitives, Óscar Manuel Bernal alias La Araña (The Spider), is considered by the Mexican authorities to be "extremely dangerous," and is believed to be the leader of Los Zetas in the municipality of Monterrey.

On 16 March 2012, the Attorney General's Office of Nuevo León confirmed that 37 prisoners had actually escaped on the day of the massacre. Four days later, however, the new figures of the fugitives went down to 29. The governor of Nuevo León, Rodrigo Medina, mentioned on 20 February 2012 that 30 inmates escaped from the prison during the riot. The fight was between Los Zetas and the Gulf Cartel, two drug cartels that operate in northeastern Mexico. The Blog del Narco, a blog that documents events and people of the Mexican Drug War anonymously, reported that the actual (unofficial) death toll may be more than 70 people. Mexico City officials stated that at least 44 people were killed, with another twelve injured. The Apodaca prison riot occurred on 19 February 2012 at a prison in Apodaca, Nuevo León, Mexico. Mexico is supported by the United States in this conflict through the Mérida Initiative.
