Prosecutors said Monday they have indicted four major domestic refiners in a 26 trillion-won ($17 billion) price-fixing case following the outbreak of the U.S.-Iran war earlier this year. HD Hyundai Oilbank Co., SK Energy Co., GS Caltex Corp. and S-Oil Corp. face charges of violating the fair trade act by engaging in collusive activities to raise prices of petroleum-related goods after the war triggered sharp rises in global energy prices in late February, according to the Seoul Central District Prosecutors Office. Multiple company officials, including those from HD Hyundai Oilbank's pricing department, have also been indicted in the case. Prosecutors accused HD Hyundai Oilbank and SK Energy of direct collusion valued at 14.2 trillion won and the other two of matching the rigged price hikes, undermining market competition by a total of around 26 trillion won. Their investigation found that HD Hyundai Oilbank and SK Energy colluded on the timing and scale of price increases for petroleum products after the outbreak of the war. GS Caltex and S-Oil, which determine price levels based on thos