Two Missouri Senators are asking Attorney General Chris Koster to investigate the steep increase in the price of propane gas last week. In less than 24 hours last week, the price of propane rose $1.25 at the wholesale level to $3.55 per gallon. According to the U.S. Energy Information Administration, between September and October of 2013, exports of propane from the United States rose by 73,000 barrels a day. The senators claim that level of exports so close to winter almost guaranteed a domestic shortage. Because extremely cold temperatures remain in the forecast in the coming week, the situation could get worse. Some suppliers indicate that even with the higher prices, the propane simply isn’t available to buy. The senators are suspicious the tight supplies are a manufactured crisis to artificially boost propane prices.