On 19 February 2012 , in the city of Apodaca , Nuevo León , 44 were killed and 12 were injured in a prison riot ; the brawl was , according to local authorities , between the Gulf Cartel and Los Zetas , their former allies . In the state of Durango , 19 inmates were killed in the prison of Gómez Palacio on 25 August 2009 ; in the same prison on 21 January 2010 , about 23 inmates were killed in a brawl . On 19 May 2011 , a shooting inside a prison in Durango left 8 prisoners dead , and on 15 November 2010 a group of gunmen threw a grenade inside the prison . In Tijuana , Baja California on 18 September 2008 , nearly 19 inmates were killed in a brawl between rival drug cartel members
prison riot
Apodaca prison riot
Altamira prison brawl