The attack late Saturday targeted 28 Germans and their two tour guides in the town of Palenque in the southern state of Chiapas.
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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