* Brent falls as much as 2.2 pct to $111.19/bbl
* Japan's Nikkei share average plunges as panic grips Tokyo
* Saudi troops enter Bahrain to help calm protests
* Coming up: US API weekly inventory data
(Recasts throughout, changes dateline to London)
By Nia Williams
LONDON, March 15 (Reuters) - Brent crude fell by as much as 2.2 percent to below $112 as a deepening nuclear crisis in Japan and rising radioactivity levels heightened risk aversion across financial markets.
Japanese authorities warned that radiation levels had become significantly higher around the nuclear power plant on Tuesday after explosions at two reactors, and the French embassy said a low-level radioactive wind could reach Tokyo within hours.
April Brent <LCOc1> fell $2.04 to $111.63 a barrel at 0922 GMT after trading as low as $111.19. Prices on Monday touched a two-week low of $111.16, down more than 7 percent from a 2-1/2 year high hit on Feb. 24. U.S. crude for April <CLc1> dropped $2.16 to $99.03.
"It's a combination of uncertainty and risk aversion," said Commerzbank analyst Eugen Weinberg. "It's not really fundamental concerns that Japan, one of the largest oil consumers, will be missing over the next few months. It's more sentiment that is depressing the prices of risk assets such as equities and commodities."
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Japan's unfolding disaster: http://r.reuters.com/mak58r
Japan graphics suite: http://r.reuters.com/quh58r
How a meltdown can occur: http://r.reuters.com/rah58r
Nuclear plants, quakes zones: http://r.reuters.com/qah58r
World's costliest disasters: http://r.reuters.com/jah58r
LIVE COVERAGE
http://live.reuters.com/uk/Event/Japan_earthquake2
Japan quake rips through commodities, energy:
http://link.reuters.com/bum58r
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Japanese stocks plunged more than 14 percent, heading for their biggest drop since 1987 as concerns grew over the economic impact of the unfolding disaster [
]Oil demand from Japan, the world's third-largest user, is likely to decline in the short term as manufacturing and transport slow but could then rise as the country seeks to replace nuclear with oil-fired power during reconstruction efforts.
The International Energy Agency (IEA) said on Tuesday global oil demand was likely to be lower than previously forecast in 2011 as a result of a price shock and trimmed its forecast by 10,000 barrels to 1.44 million barrels per day. [
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SAUDI TROOPS IN BAHRAIN
Oil markets were also keeping a close eye on developments in the Middle East, where Saudi Arabia sent troops into Bahrain on Monday to help calm weeks of protests by the Shi'ite Muslim majority. [
]Opponents of Bahrain's Sunni ruling family called the move a declaration of war, while Iran denounced it as unacceptable and the United States urged its nationals to leave the island, which is home to the U.S. Navy's Fifth Fleet.
"Oil prices may have come under stronger pressure if we had not had developments in the Middle East," said Weinberg. "The market's most important concern is what is going on in Japan, but if that is resolved focus will return to the Middle East."
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Reuters Global Oil Forum will host an interactive Q+A with IHS Global Insight Middle East specialist Samuel Ciszuk from 1530 GMT (1130 EDT) on Tuesday to discuss the political outlook for the oil market. To visit Reuters Global Oil Forum:
rmchat://room/thomsreuters.com/Global_Oil_Forum
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Unrest has simmered across the Middle East for two months after popular uprisings toppled the leaders of Tunisia and Egypt, while Libya entered a civil war that has cut its oil output by at least two-thirds from normal levels.
In Libya, Muammar Gaddafi's jets bombed rebels on Monday in a counter-offensive that has pushed them back 100 miles (160 km) in a week, far outpacing diplomatic efforts to impose a no-fly zone to help the insurgents. [
]On the data front, markets were looking towards weekly U.S. inventory numbers from industry group American Petroleum Institute. A Reuters poll indicated U.S. crude oil stockpiles probably rose by 1.8 million barrels last week. [
](Additional reporting by Alejandro Barbajosa, editing by Jane Baird)