mexico city least 13 people kill battle rival gang two state central western mexico officials say wednesday murder climb record level year five people gun bar tuesday night capital central guanajuato state seven people find dead two different place western state michoacan accord officials state prosecutors offices three dismember body include woman find community angahuan near drug-gang hotbed uruapan michoacan prosecutors office say michoacan one bloody state mexico battle rival gang involve drug traffic kidnap extortion local businesses well mineral theft illegal log neighbor guanajuato state see spike violence murder 37 percent guanajuato first seven months year compare period last year murder rate already rise level see 2011 deadly year former president felipe calderon send army battle drug gang nationally 14,190 murder investigations first seven months year high total july year record go back 1997. increase violence hit popularity president enrique pena nieto institutional revolutionary party pri ahead next year presidential election 13 kill gang battle two mexican state