Benchmark oil for November delivery dropped 35 cents to USD 101.99 per barrel at midday Bangkok time in electronic trading on the New York Mercantile Exchange.
The contract fell 54 cents to close at USD 102.33 yesterday after trading as low as USD 101.05.
Just as the US economy is struggling to expand, infighting among US lawmakers is threatening to slow growth even further.
Yesterday, the last day of the current budget year, Congress failed to reach a critical agreement on short-term funding. That means some of the government must halt operations.
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"When you're in a time of lower funding and money, you tend to cut things like travel," said Evan Lucas, market analyst at IG in Melbourne, Australia.
After climbing to over USD 110 in late August, the price of oil has fallen as diplomacy aimed at Syria and Iran eased concerns about Middle East supplies.
"Considering there was a big run-up in oil prices two weeks ago, it's just a bit of a correction," Lucas said.