Sorry, I must have deleted that part of the post before sending it. The protestors were mostly all females, signs despite my poor Spanish referred to school/education issues.
There have been other recent similar protests in the area (Chiapas) by school teacher unions - including one between San Crisobal and Palenque...
Link on former protests:
poke hereFrom the link "Teachers from the National Coordinating Committee of Education Workers (CNTE) increased their demonstrations in the states of Michoacán, Quintana Roo, Veracruz, Chiapas, Tabasco and Zacatecas, occupying municipal government headquarters and highways, as well as facilities of these states. "