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 .

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 .

VIENNA -LRB- Reuters -RRB- - OPEC sailed through a brief , calm meeting on Wednesday - even as oil prices rose Movement.up.gain to $ 110 a barrel on concern Negative_sentiment renewed strife Civil.unrest could hit Iraq 's output and deepen Situation_deteriorate a supply shortfall Shortage from chaotic Libya and sanctions-bound 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 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 .

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 .

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 .