The attack late Saturday targeted 28 Germans and their two tour guides in the town of Palenque in the southern state of Chiapas.
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One guide, Mary Gramilich, said her group, on the latest stop of a tour across Mexico, was accosted at the historic site by several armed and hooded men carrying knives and guns.
They stole their money, cameras and other valuables.
The pre-Hispanic archaeological site, with its well-preserved Mayan pyramids, was designated in 1987 as a UNESCO world heritage site.
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