Officials said the fight erupted following a dispute between leaders of two rival groups, including one led by a member of the Zetas drug cartel. The 60-year-old penitentiary houses 3,800 inmates, twice its capacity.
San Cristóbal de las Casas is home to several hundred members of Mexico's growing Muslim community. The small, indigenous city in southern Mexico will greet Pope Francis in three weeks.
Millions of Mexicans pay for everything from food to medicine with cash from relatives working in the U.S. Now, the money may allow them to get car loans in a country where a large swath of the population has no access to credit.
Authorities have expanded the search for 43 missing students in Mexico who vanished after they were abducted by corrupt police in 2014, a government official said.
