Federal police opened fire on striking teachers blocking a road through Mexico's southern Oaxaca state, leaving six dead—a significant escalation in the battle over the government's proposed education reform. Some 50 civilians and a similar number of federal and state police officers were also reported injured in the May 20 clash at Nochixtlán. Striking teachers and their left-wing supporters set vehicles on fire at the roadblock. Followers of the dissident CNTE teacher's union have been blocking roads across Mexico's south to oppose the reform program. The state-owned oil company, Pemex, has warned that it may be forced to close a refinery in the area if the highway linking Oaxaca to Mexico City remains blocked. The clash comes two days after the leader of the Oaxaca section of the CNTE, Rubén Núñez, was ordered imprisoned by federal authorities on corruption charges that are rejected as political by the union. (Animal Politico, The Guardian, June 20; El Universal, PubliMetro, June 18)