Article Photos: In Mexico, self-defense squads battle violence 3/13

Armed and masked men leave during a shift change at a roadblock at the entrance to the community of El Pericon near Ayutla, early Saturday, Jan. 19, 2013. Hundreds of men have taken up arms in several towns of the southern state of Guerrero to defend their communities against violent criminal gangs. (AP Photo/Dario Lopez-Mills)