MEXICO CITY (AP) — Armed vigilantes in southern Mexico engaged in a shootout Wednesday with a group of men they described as criminals, killing one in what appeared to be the first death related to the month-and-a-half-old “self-defense” movement.

The confrontation near the town of Ayutla raised the stakes in a growing movement that has seen residents of several towns arm themselves with a motley assortment of old hunting rifles, shotguns and pistols while conducting patrols and manning checkpoints to fight crime spawned by drug cartels.