Article Photos: In Mexico, self-defense squads battle violence 9/13

In this photo taken Friday Jan. 18, 2013, masked and armed men guard a roadblock in Las Mesas, near the town of Ayutla, Mexico.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)