* Oil falls more than $6 a barrel
* U.S. politicians to vote on banking bailout
* Iran avoids new sanctions in UN council vote
(Updates prices)
By Jane Merriman and Alex Lawler
LONDON, Sept 29 (Reuters) - Oil fell more than $6 a barrel to $100 on Monday, pressured by gains in the U.S. dollar as well as more signs the financial crisis is spreading beyond the United States to Europe.
U.S. regional bank Wachovia Corp <WB.N> succumbed to the credit crisis on Monday and authorities stepped in to rescue three European banks as U.S. lawmakers prepared to vote on a $700 billion financial bailout plan.
U.S. crude <CLc1> fell $6.55 to $100.34 a barrel by 1430 GMT, having fallen as low as $99.80 earlier in the session. London Brent crude <LCOc1> lost $6.21 to $97.33.
"There are two factors at play here," said Jonathan Kornafel, Asia director of Hudson Capital Energy in Singapore. "One is the short-term effect of a rally in the U.S. dollar and second is ongoing concerns about U.S. demand and elsewhere. I think the demand destruction will be significant enough to cut quite deeply into oil prices."
The euro fell against the dollar on Monday as the financial crisis spread further outside the United States. The dollar rallied as the proposed financial rescue plan looked set for approval.
U.S. congressional leaders from the Republicans and the Democrats said they had reached a tentative agreement on the bailout plan on Sunday and prepared to vote on it on Monday.
Questions remain over the ability of the plan to restore confidence to shaky markets and head off a deep recession. [
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DEMAND DESTRUCTION
"From a commodity perspective, our more pressing concern is to what extent the U.S. virus spreads globally and specifically to China," said Deutsche Bank in a research note.
"We expect demand destruction fears into early 2009 will bear down on many commodity prices."
Falls in demand in the United States and other developed economies have contributed to oil's drop from a record high of $147.27 a barrel in July.
Analysts said mounting evidence of an economic slowdown in the United States, Europe and Japan would continue to weigh on prices.
"While supply-side uncertainty suggests a floor near $100, the economic context for this quarter and next is weak, suggesting price rallies will be capped and/or sold into," Harry Tchilinguirian, a senior oil market analyst at BNP Paribas, said in a research report.
The slow pace of recovery following shutdowns due to hurricanes in oil and gas production in the U.S. Gulf of Mexico, home to a quarter of U.S. output, could offer some support for prices in the short term.
Iran, the world's fourth-largest exporter of oil, avoided new sanctions in a United Nations vote at the weekend.
The U.N. Security Council unanimously passed a resolution on Saturday that again ordered Iran to halt its nuclear enrichment work but imposed none of the new sanctions Washington and its allies wanted. [
]Political tensions over Iran's nuclear programme was one of the factors that helped drive oil higher this year. (Additional reporting by Fayen Wong in Perth; editing by Karen Foster/James Jukwey)