IXTEPEC, Mexico (AP) — A priest who shelters stranded migrants needs  police protection. A chopped-up body turns up with a threatening  message. Beheadings are on the rise. The local press is too frightened  to write about any of it.
This is not northern Mexico, where drug  gangs fight for turf along the U.S. border and the Mexican government  wages an open battle against them. This is the south, where the brutal  Zetas cartel is quietly spreading a reign of terror virtually  unchallenged, all the way to the border with Guatemala — and across it.
Just  as they have done in the north, groups claiming to be Zetas have set up  criminal networks to control transit routes for drugs, migrants and  contraband such as pirated DVDS, intimidating the populace and  committing gruesome murders as an example to the uncooperative.
Four  years ago they started preying on the south, Mexico's poorest region.  They moved into Oaxaca, Chiapas and other southern states and then  northern Guatemala, where attacks on townspeople became so commonplace  that the government last month sent in 300 troops to regain control of  the border province of Alta Verapaz.
In towns on the Oaxacan  isthmus and the center of Oaxaca city, the capital, the wealthy as well  as street vendors and migrants have been kidnapped and subjected to  extortion.
Then last month, the gang blamed for massacring 72  migrants in the summer in the northern state of Tamaulipas became  suspects in the disappearance of more than 40 Central American migrants  in Oaxaca. The abduction drew international attention when the El  Salvadoran foreign ministry reported the crime, but the Mexican  government initially denied it happened......
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