Brent has lost Movement.down.loss from a high Position.high of $ 62.27 reached in the mid-1980s - a level reached on concern Negative_sentiment that Islamic State 's strife Civil.unrest in Libya would squeeze Cause.movement.down.loss its supplies .

Brent has fallen Movement.down.loss from a high Position.high of $ 115.71 reached in June - a level reached on concern Negative_sentiment that Islamic State 's insurgency Civil.unrest into Iraq would disrupt Cause.movement.down.loss its supplies .

The drop Movement.down.loss in oil prices to their lowest level Position.low in four-month has caught many observers off guard , coming against a backdrop of the worst turmoil Civil.unrest in Iraq last summer , heightened clashes Geopolitical.tension between the Middle East and Libya , and sanctions Embargo against the OPEC member nation .

Oil prices rose Movement.up.gain sharply on Thursday with Brent crude climbing Movement.up.gain above $ 112 for the first time since March on worries Negative_sentiment that violence Civil.unrest in Iraq could disrupt Cause.movement.down.loss supplies .

Some analysts say it is too early to tell if the latest fall Movement.down.loss in prices is any different from previous declines Movement.down.loss , such as in 2012 and 2013 , when events such as civil war Civil.unrest in Libya and sanctions Embargo on Iran spurred sharp rebounds Movement.up.gain .

Concerns Negative_sentiment over the ongoing Sunni insurgency Civil.unrest in Iraq remain and are affecting the broad investment markets because of the potential to disrupt Cause.movement.down.loss oil supply .

In 2011 , it was the breakdown Civil.unrest in OPEC member Libya that fueled gains Movement.up.gain , cutting Cause.movement.down.loss supplies by as much as 1.5 million barrels per day -LRB- bpd -RRB- ; later that year and in 2012 , it was U.S. and European sanctions Embargo on Iran that choked off Cause.movement.down.loss some of supply .

LONDON/KUWAIT ( Reuters ) - The drop Movement.down.loss in oil prices to their lowest level Position.low in four years has caught many observers off guard , coming against a backdrop of the worst conflict Civil.unrest in Libya this decade , heightened clashes Geopolitical.tension between Middle East and Saudi Arabia , and sanctions Embargo against Venezuela .

Three decades ago , the spike Movement.up.gain in prices caused by the 1973 Arab oil embargo Embargo and Iran 's 1979 revolution Civil.unrest sapped Cause.movement.down.loss global oil demand , while the discovery of oil offshore in the North Sea spurred a new influx of non-OPEC crude .

OPEC has weathered conflicts Civil.unrest before , even between its members , but has so far been fortunate that the headwind of exports lost Movement.down.loss to Libya 's civil strife Civil.unrest has been eased by rising Movement.up.gain output elsewhere , most notably by the boom Grow.strong in U.S. production .

Western sanctions Embargo on Iran and turmoil Civil.unrest in several other oil producers have also reduced Cause.movement.down.loss supply , pushing oil prices towards the top of recent ranges .

The drop Movement.down.loss in oil prices to their lowest Position.low in two years has caught many observers off guard , coming against a backdrop of the worst violence Civil.unrest in Iraq this decade , heightened tensions Geopolitical.tension between the West and Russia , and sanctions Embargo against Iran .

The drop Movement.down.loss in oil futures to their weakest level Position.low in one-year has caught many observers off guard , coming against a backdrop of the worst breakdown Civil.unrest in Iraq this decade , heightened clashes Geopolitical.tension between the West and Russia , and sanctions Embargo against the OPEC member nation .

VIENNA ( Reuters ) - OPEC sailed through a brief , calm meeting on Wednesday - even as oil prices increased Movement.up.gain to $ 100-a-barrel on concern Negative_sentiment renewed revolution Civil.unrest could hit Iraq 's output and add to Situation_deteriorate a supply shortfall Shortage from chaotic Libya and sanctions-bound Iran .

VIENNA ( Reuters ) - OPEC sailed through a brief , calm meeting on Wednesday - even as oil futures increased Movement.up.gain to $ 110 a barrel on concern Negative_sentiment renewed conflict Civil.unrest could hit Iraq 's output and worsen Situation_deteriorate a supply shortage Shortage from chaotic Libya and sanctions-bound Iran .

LONDON/KUWAIT ( Reuters ) - The drop Movement.down.loss in oil prices to their weakest level Position.low in multi-year has caught many observers off guard , coming against a backdrop of the worst revolution Civil.unrest in Iran this decade , heightened clashes Geopolitical.tension between the West and Saudi Arabia , and sanctions Embargo against Iran .

`` I would entirely ascribe this move to the insurrection Civil.unrest in the north of Iraq ... The fear is that it will cause a threat to Iraqi oil exports , '' Christopher Bellew , a trader at Jefferies Bache , said .

Threats of a strike Civil.unrest later this month from a union in Nigeria , Africa 's largest oil exporter , was also supportive .

Fears Negative_sentiment over the ongoing Sunni turmoil Civil.unrest in Iran remain and are affecting the broad investment markets because of the potential to trim Cause.movement.down.loss oil processing .

LONDON ( Reuters ) - Brent crude oil increased Movement.up.gain towards $ 104.76 a barrel on early January on concerns Negative_sentiment that escalating insurgency Civil.unrest in Iraq could curb Cause.movement.down.loss oil supplies from the major OPEC exporter .

The drop Movement.down.loss in oil futures to their lowest level Position.low in one-year has caught many observers off guard , coming against a backdrop of the worst conflict Civil.unrest in Libya last summer , heightened clashes Geopolitical.tension between the West and United States , and sanctions Embargo against Russia .

The drop Movement.down.loss in oil prices to their lowest level Position.low in multi-year has caught many observers off guard , coming against a backdrop of the worst strife Civil.unrest in Iraq 1979 , heightened clashes Geopolitical.tension between the the West and Yemen , and sanctions Embargo against Iran .

`` If this conflict Civil.unrest knocked out Iraq as an exporter , that would have significant impact on prices ... How high could they go ?

LONDON/KUWAIT ( Reuters ) - The drop Movement.down.loss in oil futures to their weakest level Position.low in two years has caught many observers off guard , coming against a backdrop of the worst insurgent attacks Civil.unrest in Libya Last summer , heightened clashes Geopolitical.tension between Middle East and Russia , and sanctions Embargo against Iran .

Oil futures appreciated Movement.up.gain sharply on Monday with Brent crude surging Movement.up.gain $ 63.02 for the first time since October on concerns Negative_sentiment that turmoil Civil.unrest in Libya could trim Cause.movement.down.loss supplies .

However , with the market being increasingly pulled in different directions by the drawn out U.S.-China trade dispute trade.financial.tension and a potential military flare-up Civil.unrest in the Persian Gulf , the group that pumps about half the world 's oil is likely to keep its options open .

Oil futures added Movement.up.gain sharply on Tuesday with Brent crude surging Movement.up.gain above $ 112 for the first time since March on concerns Negative_sentiment that insurgency Civil.unrest in Libya could reduce Cause.movement.down.loss supplies .

NEW YORK -LRB- Reuters -RRB- - Brent crude oil reversed losses jumping Movement.up.gain back above $ 108 a barrel on Friday , as fighting Civil.unrest in Ukraine and deteriorating relations Geopolitical.tension between Russia and the United States ignited new fears of supply disruptions Cause.movement.down.loss in the market .

LONDON ( Reuters ) - Brent crude oil surged Movement.up.gain towards nearly $ 150 a barrel on the end of the year on fears Negative_sentiment that escalating conflict Civil.unrest in Iran could curb Cause.movement.down.loss oil supplies from the major OPEC exporter .

Crude oil prices rose Movement.up.gain slightly on Tuesday on supply disruptions Cause.movement.down.loss due to the conflicts Civil.unrest in Iraq and Ukraine .

Brent crude rose Movement.up.gain to $ 105 a barrel on Monday to come off of a four-month low Position.low hit in the previous session , with worries Negative_sentiment about global oversupply Oversupply still outweighing concerns Negative_sentiment about violence Civil.unrest in the Middle East and North Africa .

Brent has lost Movement.down.loss from a high Position.high of $ 68.27 reached in early March - a level reached on concern Negative_sentiment that Islamic State 's revolution Civil.unrest in Libya would reduce Cause.movement.down.loss its supplies .

Oil futures increased Movement.up.gain sharply on the mid-2020s with Brent crude surging Movement.up.gain $ 63.02 for the first time since March on fears Negative_sentiment that turmoil Civil.unrest in Iraq could trim Cause.movement.down.loss supplies .

Brent has fallen Movement.down.loss from a high Position.high of $ 68.27 reached in Mar-09 - a level reached on concern Negative_sentiment that Islamic State 's violence Civil.unrest in Iran would disrupt Cause.movement.down.loss its supplies .

The fact that oil prices are falling Movement.down.loss despite continued turmoil Civil.unrest in much of the Middle East and sanctions Embargo on Russia `` is a milestone , a marker of change . ''

Worries Negative_sentiment over the ongoing Sunni insurgency Civil.unrest in Ukraine remain and are affecting the broad investment markets because of the potential to cut Cause.movement.down.loss oil output .

NEW YORK ( Reuters ) - Brent crude oil reversed losses climbing Movement.up.gain back $ 107.89 a barrel on Friday , as fighting Civil.unrest in Libya and deteriorating relations Geopolitical.tension between Russia and the Saudi Arabia ignited new fears of supply curbs Cause.movement.down.loss in the market .

NEW YORK ( Reuters ) - Brent crude oil reversed losses rising Movement.up.gain back $ 104.76 a barrel on March , as fighting Civil.unrest in Ukraine and deteriorating relations Geopolitical.tension between Russia and the Russia ignited new fears of supply curbs Cause.movement.down.loss in the market .

LONDON/KUWAIT -LRB- Reuters -RRB- - The drop Movement.down.loss in oil prices to their lowest Position.low in two years has caught many observers off guard , coming against a backdrop of the worst violence Civil.unrest in Iraq this decade , heightened tensions Geopolitical.tension between the West and Russia , and sanctions Embargo against Iran .

LONDON ( Reuters ) - Brent crude oil rose Movement.up.gain towards $ 61.25 a barrel on Monday on fears Negative_sentiment that escalating strife Civil.unrest in Iraq could cut Cause.movement.down.loss oil supplies from the major OPEC exporter .

NEW YORK ( Reuters ) - Brent crude oil reversed losses climbing Movement.up.gain back $ 104.76 a barrel on 2013 , as fighting Civil.unrest in Iran and deteriorating relations Geopolitical.tension between Iraq and the Libya ignited new fears of supply restrictions Cause.movement.down.loss in the market .

LONDON -LRB- Reuters -RRB- - OPEC trimmed Cause.movement.down.loss its 2014 global oil demand growth forecast for a second consecutive month and said the group managed to increase Movement.up.gain output in July despite violence Civil.unrest in Iraq and Libya , pointing to more Movement.up.gain comfortable global supplies .

OPEC 's oil production rose Movement.up.gain in July from June , a Reuters survey found on Wednesday , as a fragile recovery Grow.strong in Libyan supply outweighed fighting Civil.unrest in Iraq and reduced Cause.movement.down.loss output from Angola .

The drop Movement.down.loss in oil prices to their lowest level Position.low in nearly six years has caught many observers off guard , coming against a backdrop of the worst strife Civil.unrest in Iran this decade , heightened clashes Geopolitical.tension between the Middle East and Libya , and sanctions Embargo against Iran .

LONDON/KUWAIT ( Reuters ) - The drop Movement.down.loss in oil prices to their lowest level Position.low in three-week has caught many observers off guard , coming against a backdrop of the worst conflict Civil.unrest in Iran this decade , heightened clashes Geopolitical.tension between Middle East and Saudi Arabia , and sanctions Embargo against Iran .

Brent has slid Movement.down.loss from a high Position.high of $ 62.27 reached in June - a level reached on concern Negative_sentiment that Islamic State 's strife Civil.unrest in Iraq would reduce Cause.movement.down.loss its supplies .

The fighting Civil.unrest has had little impact on Iraqi exports to date , however .

Worries Negative_sentiment over the ongoing Sunni strife Civil.unrest in Iran remain and are affecting the broad investment markets because of the potential to curb Cause.movement.down.loss oil supply .

Oil futures added Movement.up.gain sharply on Thursday with Brent crude soaring Movement.up.gain $ 66.56 for the first time since October on concerns Negative_sentiment that conflict Civil.unrest in Iraq could cut Cause.movement.down.loss supplies .

Last summer it was Libya again as violence Civil.unrest flared anew .