* Brent dips below $108/bbl for first time since Feb. 23
* Bahrain declares martial law after Saudi troops arrive
* Coming up: API oil data at 4:30 p.m. EDT Tuesday
(Updates prices, changes byline and moves dateline from previous LONDON)
By Robert Gibbons
NEW YORK, March 15 (Reuters) - Oil prices fell sharply on Tuesday as a deepening nuclear crisis in Japan caused by last week's catastrophic earthquake and tsunami heightened risk aversion across financial markets.
A magnitude 6.0 earthquake hit eastern Japan on Tuesday, hours after the French Nuclear Agency said the country's nuclear crisis is equivalent to number six on the INES scale of nuclear accidents from one to seven. The 1986 Chernobyl disaster was a seven and Three Mile Island a five.
Panic buying broke out in Tokyo shops after explosions at two nuclear reactors sent a low-level radioactive wind towards the capital on Tuesday, although officials said radiation levels at the stricken Fukushima Daiichi nuclear complex had fallen after an earlier spike. [
]Brent crude futures for April delivery <LCOc1> fell $4.07 to $109.60 a barrel at 11:04 a.m. EDT (1504 GMT), having dropped as low as $107.88, its lowest since $105.97 was struck on Feb. 23.
U.S. crude futures for April delivery <CLc1> fell $3.15 to $98.04 a barrel, having fallen as low as $96.71, lowest since $96.31 was hit on March 1.
"This is a massive risk off day today," said Christin Tuxen, analyst at Danske Bank. "The risk averse sentiment is coming through both in the equity market and euro/dollar. It's weighing on oil even though fundamental drivers should suggest an upside." <^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 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 LIVE COVERAGE http://live.reuters.com/uk/Event/Japan_earthquake2 Japan quake rips through commodities, energy: http://link.reuters.com/bum58r ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^>
Japanese stocks plunged 10.6 percent, posting the worst two-day rout 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 stall but could then rise as the country seeks to replace nuclear with oil-fired power during reconstruction.
The International Energy Agency (IEA) said 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. [
]MARTIAL LAW IN BAHRAIN
Oil markets kept a close eye on developments in the Middle East where Bahrain declared martial law on Tuesday, a day after Saudi forces arrived in the Sunni-ruled kingdom to help restore calm following weeks of protests by the island's Shi'ite Muslim majority.[
]Opponents of Bahrain's Sunni ruling family called the move by Saudi Arabia 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.
"We continue to see developments in Bahrain as an important touchstone for the rest of the region," said Barclays Capital analyst Amrita Sen. "It appears likely that the other governments are determined to contain unrest to Bahrain for fear of a heightened external influence in the region."
An opposition politician said a Bahraini man was killed in clashes with police and analysts said escalating violence in the Middle East would be likely to support oil prices. <^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 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 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^>
In Libya, Muammar Gaddafi's forces bombarded two rebel-held towns as the battle for eastern Libya edged closer to the insurgent stronghold Benghazi, 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 Nia Williams and Ikuko Kurahone in London and Alejandro Barbajosa in Singapore; Editing by Marguerita Choy)