According to CNN, more than 400 prison inmates escaped from several prisons in Tamaulipas from January 2010 to March 2011 due to corruption [REF].
On 4 January 2012, in the city of Altamira, Tamaulipas, 31 were killed and 13 were injured in a prison brawl; the brawl was, according to local authorities, between the Gulf Cartel and Los Zetas, their former allies [REF].