* Nigerian output loss underpins prices, but dollar weighs
* Saudi says ready to boost output, raise capacity
* OPEC President says sees no demand for more oil
By Santosh Menon
(Updates prices)
LONDON, June 23 (Reuters) - Oil pulled back from session highs on Monday, pressured by gains in the U.S. dollar.
Earlier oil had advanced more than $2 a barrel as Saudi Arabia's promise to pump more oil if needed failed to win over a sceptical market.
A ceasefire by rebels halting attacks on facilities in the Niger delta barely tempered the rise after two new attacks over the past week knocked out another tranche of Nigerian output.
U.S. light crude for August delivery <CLc1> was down $1.20 at $134.16 a barrel by 1310 GMT. The market had initially fallen more than $1 and then rallied more than $2.
London Brent crude <LCOc1> was down 91 cents at $133.95.
"The market took the opportunity to take profits earlier on Saudi Arabia's promise... but realistically that alone is not enough to calm the market," said Mark Pervan, senior commodities analyst at Australia and New Zealand (ANZ) Bank in Melbourne.
Oil prices hit a record near $140 a barrel last week and have doubled from a year ago, stoking inflation and triggering protests worldwide. A meeting of top energy policy makers in Jeddah at the weekend offered little hope for a quick fix.
Top exporter Saudi Arabia confirmed it will lift production for a second time to 9.7 million barrels per day (bpd) in July, its highest in more than 30 years, and pledged on Sunday to pump even more if the market demanded it. [
]It detailed plans to boost capacity to 15 million bpd when future demand warrants the investment, in a bid to soothe growing fears that the world is running out of oil, but those measures failed to allay fears in an anxious market.
"With the immediate benefit of higher Saudi production seemingly already lost, and with limited visibility on capacity expansion plans, there seems to be little here to cool prices," Citi analysts said in a note.
Analysts said the short-term supply situation was still very tight, putting tensions between Iran and Israel back in focus.
Iran said it would give a "devastating" response to any attack on the country, the latest in an ongoing war of words centred on Tehran's nuclear programme.
The New York Times quoted U.S. officials last week as saying Israel had carried out a large military exercise, in an apparent rehearsal for a potential bombing of Iran's nuclear facilities.
Energy experts are concerned any conflict in Iran could lead to a shutdown of the Strait of Hormuz, a narrow waterway separating Iran from the Arabian Peninsula through which roughly 40 percent of the world's traded oil is shipped.
JEDDAH OVERSHADOWED
Sunday's emergency meeting in Jeddah infused new urgency to the ongoing dialogue of major producers and consumers, participants said, but acknowledged a lack of hard measures for taming oil's rally could leave the market underwhelmed.
"The meeting was a bit disappointing," said a European diplomat. "The only producer that came up with any concrete proposals was Saudi Arabia -- all the other producers just made bland statements about future capacity plans."
OPEC President Chakib Khelil said on Monday oil producers could not pump more without demand for extra supply, and at the moment that demand did not exist.
In the end, Jeddah was overshadowed by news from Nigeria, where militants in the southern Niger Delta announced a unilateral ceasefire on Sunday, the end of a week that saw two new attacks knock an additional 340,000 bpd offline. (Additional reporting by Fayen Wong in Perth; editing by James Jukwey)