MEXICO CITY (Reuters) – Mexico's state-run oil company Pemex is suing 11 U.S. companies for buying up to $300 million of fuel stolen by drug gangs and smuggled across the U.S.-Mexico border, court documents showed. Pemex's exploration and production (PEP) unit filed the suit on Sunday in a U.S. district court in Texas, claiming some of the companies conspired with Mexican criminals to forge documents and smuggle the hijacked natural gas condensates. "The defendants have participated and profited -- knowingly or...