MEXICO CITY, MEXICO - JUNE 21: Masked people block Insurgentes Avenue as they hold a protest for the recent violent acts in Oaxaca state, in Mexico City, Mexico on June 21, 2016. (Photo by Daniel Cardenas/Anadolu Agency/Getty Images)
MEXICO CITY, MEXICO - JUNE 21: Masked people block Insurgentes Avenue as they hold a protest for the recent violent acts in Oaxaca state, in Mexico City, Mexico on June 21, 2016. (Photo by Daniel Cardenas/Anadolu Agency/Getty Images)