2 Min Read FILE PHOTO: Tanker trucks of Mexican state oil firm Pemex's are pictured at Cadereyta refinery, in Cadereyta, on the outskirts of Monterrey, Mexico April 20, 2020. REUTERS/Daniel Becerril MEXICO CITY (Reuters) - A judge provisionally suspended modifications to Mexico’s hydrocarbons law that were intended to eliminate asymmetric price regulations against state oil company Petroleos Mexicanos (Pemex), court documents showed on Monday. The modifications are part of President Andres Manuel Lopez Obrador’s efforts to roll back the previous government’s liberalization of the energy market, which aimed to increase private investment in the industry and boost competition. The asymmetric regulation, which was contained in a transitory article in the hydrocarbons law, sought to offset Pemex’s dominant power in the market for oil and gas products and fuels. Congress removed the curbs in late April.