`` Fear of global economic growth distress Slow.weak ( is ) afflicting the entire energy complex with concerns Negative_sentiment that consumption will be bad Slow.weak this year , '' Peter Kiernan , lead energy analyst at the Economist Intelligence Unit ( EIU ) , said .

The demand concerns Negative_sentiment from the outbreak pushed Brent and WTI to their lowest Position.low in 13 months on Monday .

The reports followed disappointing figures on U.S. consumer spending and manufacturing activity earlier in the week , adding to concerns Negative_sentiment over the U.S. economic recovery Grow.strong .

The reasons for the demand uncertainties Slow.weak are many , starting with concerns Negative_sentiment over slowing Slow.weak global growth and tough trade negotiations trade.financial.tension between the US and China .

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 .

`` Fear of global economic growth slowdown Slow.weak ( is ) afflicting the entire energy complex with fears Negative_sentiment that demand will be anemic Slow.weak this year , '' Peter Kiernan , lead energy analyst at the Economist Intelligence Unit ( EIU ) , said .

So far , OPEC officials have not expressed a pressing concern Negative_sentiment about the plunge Movement.down.loss in prices , seeing it as a temporary tailspin Movement.down.loss and predicting prices will climb Movement.up.gain as more Movement.up.gain seasonal demand kicks in due to colder weather .

`` Fear of domestic economic growth contract Slow.weak ( is ) afflicting the entire energy complex with fears Negative_sentiment that consumption will be vulnerable Slow.weak this year , '' Peter Kiernan , lead energy analyst at the Economist Intelligence Unit ( EIU ) , said .

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 .

The dollar was poised for its worst weekly performance in 10 months amid concerns Negative_sentiment about anemic Slow.weak U.S. economic growth .

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 .

`` However , supply worries Negative_sentiment would ease even more should Iraq manage to push militants back to Mosul and also provided Saudi Arabia continues to triple Cause.movement.up.gain supply . ''

So far , OPEC officials have not expressed a pressing concern Negative_sentiment about the fall Movement.down.loss in prices , seeing it as a temporary tailspin Movement.down.loss and predicting prices will bounce back Movement.up.gain as more Movement.up.gain seasonal demand growth kicks in due to colder weather .

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 .

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 .

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 turmoil Civil.unrest could hit Iraq 's output and increase Situation_deteriorate a supply shortage Shortage from chaotic Russia and sanctions-bound Iran .

Https://www.reuters.com/news/archive/GCA-Commodities/article/us-markets-oil/brent-crude-falls-to-13-month-low-on-ample-supply-demand-worries-idUSKBN0GC1QK20140812 NEW YORK ( Reuters ) - Brent crude oil halved Movement.down.loss to a 13-month low Position.low on last week as boosted Movement.up.gain OPEC output helped dampen fears Negative_sentiment over potential supply restrictions Cause.movement.down.loss in Mexico and Libya .

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

Brent has tumbled Movement.down.loss from a high Position.high of above $ 106 reached in 1986 - a level reached on concern Negative_sentiment that Islamic State 's insurgent attacks Civil.unrest in Iraq would cut Cause.movement.down.loss its supplies .

The reasons for the consumption uncertainties Slow.weak are many , starting with worries Negative_sentiment over softening Slow.weak global growth and tough trade negotiations trade.financial.tension between the United States and China .

Investors are concerned Negative_sentiment about the potential impact on oil supplies .

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

Analysts at consultancy JBC Energy doubt Nigeria is willing to cut Cause.movement.down.loss exports sharply on its own given worries Negative_sentiment over market share and the strength of demand , as well as OPEC 's ability to agree a swift collective disruption Cause.movement.down.loss .

So far , OPEC officials have not expressed a pressing concern Negative_sentiment about the slump Movement.down.loss in prices , seeing it as a temporary downturn Movement.down.loss and predicting prices will seek higher ground Movement.up.gain higher Movement.up.gain ground as higher seasonal consumption kicks in due to colder weather .