Article Photos: In Mexico, self-defense squads battle violence 6/13

Armed and masked men guard a roadblock at the entrance to the community of El Pericon near Ayutla, early Saturday, Jan. 19, 2013.  Hundreds of  men in the southern Mexico state of Guerrero have taken up arms to defend their villages against drug gangs, a vigilante movement born of frustration at extortion, killings and kidnappings in a region wracked by violence. (AP Photo/Dario Lopez-Mills)