* Violence in Libya disrupts oil supply
* Concern that other big producers could suffer outages
* Top exporter Saudi Arabia sees no need to pump more
By Francis Kan
SINGAPORE, Feb 22 (Reuters) - Brent crude futures rose more than $1 on Tuesday on concern that violence in Libya could cut more of the OPEC-member's output and that a similar story could play out in other top oil producers in North Africa and the Middle East.
One international firm shut down as much as 100,000 barrels per day (bpd) of oil output in Libya, about 6 percent of production from Africa's third-largest producer.
Other big oil firms said they were withdrawing staff as Libyan leader Muammar Gaddafi fought to hang on to power and dozens were reported killed in the capital, Tripoli.
Brent crude for April delivery rose $1.13 cents to $106.87 a barrel by 0328 GMT, after rising as high as $108.18 in early trade. On Monday, Brent hit a 2-1/2 year high of $108.70.
U.S. crude for March delivery , which expires on Tuesday, touched its highest since October 2008 at $94.49 a barrel. The contract trimmed gains later to trade at $92.82 a barrel, still up more than $1 from late Monday.
"The market is very nervous over news of violence in Libya, and that's driving prices," said Yinxi Yu, a commodities analyst with Barclays Capital.
"The situation threatens to blow out in the next few days, and it looks like the uncertainty in the region is not going to be resolved anytime soon."
Libyan outages were the first impact on oil supply of a wave of protests in the world's top oil producing region that have buoyed crude prices and toppled leaders in Tunisia and Egypt.
More of Libya's 1.6 million bpd of output was under threat after the leader of the Al-Zuwayya tribe in eastern Libya said it would cut off exports unless authorities stopped violence against protesters.
OPEC
The biggest concern for oil markets would be for supply disruptions from top oil exporter Saudi Arabia. The kingdom supplies around 10 percent of the world's oil, but also holds most of the world's spare capacity.
It is the only producer able to respond quickly with large volumes of oil to compensate for a serious supply outage.
"There is spare capacity to cover Libya's production if there is a complete shutdown there, but if the unrest spreads to other parts of the Middle East, even the current capacity might not be enough," said Yu.
To date, protests in Saudi have been low key. But majority Shi'ites in neighouring Bahrain are protesting against the Sunni government and there is concern this could spread to the Shi'ite minority living in Saudi Arabia's oil-producing eastern province.
Despite high prices and the threat to Libyan output, Saudi Arabia said on Monday that oil markets were well supplied.
"We're much more focused on how the market balance is -- is it sufficiently supplied? And the answer is 'yes, abundantly'", said Deputy Saudi Oil Minister Prince Abdulaziz bin Salman Al-Saud. "Therefore, does the situation warrant any kind of intervention? I don't think so."
He also reiterated the long-held Saudi view that $70 to $80 was the fair price for oil.
OPEC ministers are gathering for a conference of oil producers and consumers in Riyadh. (Reporting by Francis Kan; Editing by Simon Webb)