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Oil prices fell more than $6 a barrel on Tuesday, the steepest decline in about a month, on fears that an inflation-induced weakening of global economies would soften fuel demand and as unrest in Iraq had no effect on the OPEC nation’s crude exports.

Brent crude futures for October settlement were down $5.84, or 5.6 per cent, at $99.25 a barrel by 1:35 p.m. EDT (1735 GMT) after touching a session low of $97.55 a barrel.

The October contract expires on Wednesday and the more active November contract was at $98.09, down 4.7 per cent.

U.S. West Texas Intermediate crude dropped by $5.24, or 5.4 per cent, to $91.77.

Inflation is near double-digit territory in many of the world’s biggest economies. This could prompt central banks in the United States and Europe to resort to more aggressive interest rate increases, which could slow economic growth and weigh on fuel demand.

The European Central Bank should include a 75-basis-point interest rate hike among its options for the September policy meeting given exceptionally high inflation, Estonian policymaker Madis Muller said on Tuesday.

German inflation rose to its highest level in almost 50 years in August, beating a high set only three months earlier, data showed. Hungary’s central bank raised its base rate by 100 basis points to 11.75 per cent.

Bets on another oversized Fed rate hike also pushed up the dollar. A stronger greenback is generally bearish as it makes it more expensive for buyers with other currencies in the dollar-denominated oil market.

Prices tumbled after comments from Iraq’s state-owned marketer SOMO that the country’s oil exports had been unaffected by unrest, said UBS analyst Giovanni Staunovo.

Baghdad’s worst clashes in years between rival Shi’ite Muslim groups continued for a second day before subsiding when powerful cleric Moqtada al-Sadr ordered his supporters to go home.

Still, SOMO said it could redirect more oil to Europe if required.

Prices felt more pressure when Russia’s fastest-growing oil producer, Gazprom Neft, said it plans to double oil output at its Zhagrin field in Western Siberia to more than 110,000 barrels per day.

Investors will watch the meeting of the Organization of the Petroleum Exporting Countries (OPEC) and allies including Russia, known collectively as OPEC+, on Sept. 5.

Saudi Arabia last week raised the possibility of production cuts from OPEC+, which sources said could coincide with a boost in supply from Iran should it clinch a nuclear deal with the West.

In another possible supply boost, Venezuela’s oil minister said the country was ready to move ahead with business with the oil major Chevron Corp, adding that progress to relaunch the operations depends on licenses by Washington.

With most producers already operating at or above capacity and growing signs that the global economy may be slowing, some reduction of supply is looking increasingly likely in the coming months, said Matt Weller, head of research at and City Index.

The American Petroleum Institute was due to release data on U.S. crude inventories at 4:30 p.m. EDT (2030 GMT) on Tuesday.

U.S. crude oil stockpiles are likely to have fallen in the week to Aug. 26, a preliminary Reuters poll showed on Monday.

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