* Oil falls more than $4 a barrel
* U.S. politicians poised to vote on banking bailout
* Benelux governments rescue Fortis
* Iran avoids new sanctions in UN council vote (Recasts, adds analyst comment, updates prices, previous PERTH)
LONDON, Sept 29 (Reuters) - Oil fell more than $4 a barrel on Monday, pressured partly by gains in the U.S. dollar as well as signs the financial crisis is spreading beyond the United States to Europe.
Benelux governments stepped in to rescue Belgian-Dutch banking group Fortis and Britain nationalised mortgage lender Bradford & Bingley.
In Washington, Congress prepared to vote on a $700 billion government rescue for the financial sector.
U.S. light crude for November delivery <CLc1> fell $3.43 to $103.46 a barrel by 0943 GMT, adding to Friday's losses of $1.13.
London Brent crude <LCOc1> fell $3.22 to $100.32.
"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," he said. "I think the demand destruction will be significant enough to cut quite deeply into oil prices.".
The U.S. dollar rose against the euro, on hopes for the U.S. bailout bill and on concerns about the spread of the credit crisis to Europe's banks. [
]U.S. congressional leaders from both parties said they had reached a tentative agreement on Sunday and prepared to vote on the rescue plan on Monday.
Questions remain over the plan's ability to restore confidence to shaky markets and head off a deep recession. [
]"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 the market's retreat from record highs above $147 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, has avoided new sanctions in a United Nations vote at the weekend.
The U.N. Security Council unanimously passed a resolution on Saturday that again orders Iran to halt its nuclear enrichment work but imposes 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. (Reporting by Jane Merriman in London and Fayen Wong in Perth, editing by Anthony Barker)