<p>Mexico City: Mexican authorities said Tuesday they dismantled four clandestine oil refineries and seized almost a million liters (6,300 barrels) of petroleum derivatives.</p> <p>For years organized crime gangs in Mexico have engaged in fuel smuggling, siphoning hydrocarbons from the pipelines and installations of the partially state-owned oil company Pemex.</p> <p>But Mexican federal prosecutors said in a statement that the "illicit fuel processing centers" shut down Tuesday represent a new twist in Mexico's lucrative underground fuel business.</p> <p>Smuggling cost Pemex around $530 million in the first half of 2026, 20 percent more than in the same period of last year.</p> <p>The statement did not say if anyone was arrested in the new raids.</p> <p>These illegal processing centers were located in the central states of San Luis Potosi, Hidalgo, and Morelos.</p> <p>Prosecutors shared photos of immense industrial tanks fitted with networks of pipes. Authorities seized containers and machinery as well as fuel.</p> <p>The constant movement of trucks in and out of these refineries, some reeking of fuel or carrying industrial pipes, tipped authorities off to the operations.</p>