Article Photos: In Mexico, self-defense squads battle violence 5/13

An armed and masked man guards a roadblock at the entrance to the town of Cruz Quemada, 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)