SAN CRISTOBAL DE LAS CASAS, Mexico (AP) — A couple of hundred armed men descended on a town in the mountains of Mexico’s southern Chiapas state, burned vehicles and at least a dozen homes, vandalized the town hall and abducted 21 people, authorities reported Tuesday.

Officials blamed a newly formed vigilante group called “El Machete,” which announced its existence only a week earlier, pledging to fight the incursion of drug cartels in the largely Indigenous mountain communities of Chiapas.

On Monday afternoon, masked men carrying rifles spread out through the town of Pantelho, moving street by street in search of alleged criminals, authorities said. The action caused a panic in the community as the men set fire to some homes.

Pedro Gómez, a local activist, said at least three vehicles and a dozen homes were burned.

The vigilantes, who appear to include members of the Tzotzil Indigenous group, are calling themselves a “self-defense force,” a phenomenon seen for years in some western Mexican states.

An official in the Chiapas state prosecutor’s office, who spoke on condition of anonymity, said an investigation into the events had been opened. The official said the gunmen belonged to El Machete.

The 21 abducted residents were taken to San José Buena Vista Tercero, the community where the vigilante group is allegedly based. The official said the gunmen were apparently looking for members of another group called “Los Herreras.”

After El Machete announced its presence earlier this month, President Andrés Manuel López Obrador said he would not accept the presence of the so-called self-defense forces.