SINGAPORE, March 22 (Reuters) - U.S. crude oil futures were steady on Tuesday as supply concerns triggered by the spreading unrest in the Middle East supported prices, but uncertainty about demand from the world's No. 3 consumer Japan capped gains.
Oil prices rose 1 percent on Monday. Total crude trading volumes remained well below average, continuing last week's trend and underscoring the uncertainty facing the market and diminished open interest, brokers and analysts said.
FUNDAMENTALS
* U.S. crude futures for April delivery gained 8 cents to $102.41 a barrel at 0025 GMT after rising $1.26, or 1.25 percent, to settle at $102.33 a barrel, off its high of $103.35. The April contract expires on Tuesday.
May Brent crude futures edged down 11 cents to $114.85. It rose $1.03, or 0.9 percent, to settle at $114.96 a barrel, off its intraday peak of $116.22 on Monday.
* Anti-aircraft fire and explosions reverberated across Tripoli for a third night on Monday and state television said several sites had come under attack in the capital.
Western powers had no immediate confirmation they had launched fresh strikes on Tripoli in a campaign to target Libyan air defences and enforce a no-fly zone.
* Prime Minister David Cameron tried to reassure a war-weary public on Monday that Britain's military involvement in Libya will not drag it into another Iraq-style conflict.
* Top generals, ambassadors and some tribes threw their support behind Yemen's anti-government protesters on Monday in a major blow to President Ali Abdullah Saleh's efforts to ride out demands for his immediate exit.
* Unrest spread in southern Syria on Monday with hundreds of people demonstrating against the government in three towns near the main city of Deraa, but authorities did not use force to quell the latest protests.
* In Japan, the No. 1 reactor at the quake-stricken nuclear power plant in Fukushima is now able to receive power from the grid, Kyodo news agency reported on Tuesday, citing the plant's operator.
* The reconnection of power at the earthquake-damaged reactors in Japan is a big step in managing the nuclear crisis, experts said on Monday, but concerns about radiation in the air, seawater and food showed the dangers are far from over.
* Japan will allow the release of an additional 22 days worth of crude oil from privately held reserves, the trade ministry said. The trade ministry had already allowed the release of 1.26 million kilolitres from reserves, or three days worth of demand, last week.
* U.S. gasoline futures posted the strongest percentage rise on Monday, though heating oil futures also rose, with gasoline benefiting from the end of the winter heating season and hopes for better driving demand ahead.
* Also supportive to products were analyst expectations that weekly reports on U.S. oil inventories will show stockpiles fell last week.
MARKETS NEWS
* The yen was broadly softer on Tuesday recognising the risk of intervention, while the U.S. dollar skidded on almost everything else as investors embraced leveraged risk trades in stocks and commodity-linked currencies.
* Buyers emerged on Monday in U.S. stocks, enticed by the biggest proposed merger of the year, though crises in Japan, the Middle East and North Africa meant market volatility would continue. Dow component AT&T rose 1.1 percent after the company announced plans to buy Deutsche Telekom's T-Mobile USA.
* Nikkei futures at the Osaka Stock Exchange jumped more than 3 percent on Tuesday on reports of progress to contain radiation leaks at a quake-stricken nuclear power plant and the yen's decline from a record high.
DATA/EVENTS 1145 U.S. ICSC chain stores yy Weekly 2030 U.S. API petroleum stocks Weekly
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(Reporting by Manash Goswami; Editing by Himani Sarkar)
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