Veracruz, an oil state on the Gulf of Mexico with a major port of the same name, has seen a spike in drug violence in recent months in what authorities say is a battle between the Zetas drug cartel, which has controlled the territory for at least a year, and its rivals. Dozens of bodies have been showing up in recent weeks, including the dumping of 35 last month on a main highway in rush-hour traffic in the city of Boca del Rio.

Two other internet postings since July have announced the arrival of group that calls itself the "Mata Zetas," or Zeta Killers, who authorities say are likely aligned with the powerful Sinaloa Cartel. Others have raised questions about whether the group's members are vigilantes or other rogue bands taking justice into their own hands against the Zetas.

The new message, presented by someone wearing a theater mask that is a trademark of Anonymous, was reportedly uploaded to websites early this month, but was first reported Friday on the website of the global intelligence think tank Stratfor.

Stratfor, in its analysis of the video, said anyone exposed by Anonymous as a Zetas collaborator - accurately or not - would be targeted by rival gangs, and the Zetas could respond by attacking internet activists even if they are not affiliated with Anonymous.

Three people have been killed recently in the northern states of Nuevo Leon and Tamaulipas by suspected Zetas who apparently believed the victims used the internet to spread information about the gang.

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