South Korea's import prices of liquefied petroleum gas (LPG) fell in September thanks to a drop in international oil prices, industry sources said Thursday. Saudi Aramco, the state-owned oil company of Saudi Arabia, has informed South Korean importers that it has lowered prices of propane and butane gas to US$790 and $865 per ton, respectively, down $45 and $20 from the previous month, according to the sources.