[4] On June 17, Petróleos Mexicanos (the Mexican state-owned petroleum company) issued an official statement warning that, if blockades continued, the plant of Salina Cruz would have to halt activities, which in turn "could lead to a low supply of fuels, diesel and turbosine in the nearby zones".
[5] On that same day, a group of federal and state policemen lifted CNTE's blockade to the main access to Salina Cruz, deploying nearly 800 elements, in a clash that lasted four hours.
"[7] The morning of Sunday June 19, the federal police initiated a clash with the members of the CNTE in Nochixtlán, where they used firearms, tear gas and rubber bullets.
[8][9] The Federal Police declared that the group that participated in the operation did not carry either firearms nor batons, however, the photographs of agencies like Associated Press and Xinhua denied this affirmation.
The National Commission of Security reacted to these images by branding them as "fake", and said that "the performance of the federal elements is always obedient to the protocols established in order to enforce the law without violating any human rights of the citizenship"[10][11][12] Later, the police did recognize the use of firearms, although according to their version, it occurred when "radical groups" began shooting at the population and at federal agents, which forced them to "change strategies"; and that "at the very end of the process, some armed personnel arrived; it was after it all had happened, the tactical retreat order had already been issued".