OREANDA-NEWS. Iraq's Sunni insurgents are targeting its main northern oil pipeline, undoing plans for a massive increase in exports as violence reaches levels unseen since the darkest days of civil war.

 Iraq's ambitious plans to ramp up its oil output have been held back by poor maintenance and technical problems. Violence is making the situation worse, and, if it continues to escalate, could have a measurable impact on global supply.

 Death tolls for the past three months in Iraq have been the highest for five years, since the days when rival Sunni and Shi'ite militias fought for control of neighborhoods and battled 170,000 U.S. troops.

 The Americans are long since gone, but sectarian animosity has re-emerged, fuelled by resentment among Sunni Muslims at what they perceive as domination by Prime Minister Nouri al-Maliki's Shi'ite majority.

 This week insurgents staged possibly their boldest attack in years, freeing hundreds of prisoners in coordinated strikes on two jails that killed dozens of troops.

 That tactical sophistication is also being turned against Iraq's oil exports, hurting plans to turn the country into the world's biggest new source of traded oil and raise the money to rebuild after decades of sanctions and war.

 "It is government crude for Sunni blood," said Abu Ammar, a Sunni tribal leader in southern Nineveh province, where a stretch of the main Kirkuk oil pipeline has repeatedly come under insurgent attack.

 "The Baghdad government should understand this message: stop spilling our blood and we'll stop attacking the oil pipeline," he said.

 "The Shi'ite government is killing and persecuting Sunnis in all parts of Iraq. As revenge we have to make the government suffer, and the best way is to keep blowing up the oil pipeline."

Iraq's oil exports have fallen this month to just 2.27 million barrels a day, a fifth below the government's target of 2.9 million bpd this year.

 Iraq has ambitious plans to increase oil exports as high as 6 million bpd after decades when production was held back by sanctions and war. Its exports reached 2.62 million bpd last November, the highest level in decades, but progress has since been reversed.

 The total has been kept down in part by technical problems that have little to do with security, especially in Basra, the southern port where few Sunnis live.

 An official at the South Oil Company said on Thursday Iraq will have to cut its exports in Basra by 400,000-500,000 barrels per day in September for maintenance.

 But one of the main reasons for the fall is the damage inflicted by insurgents to the Kirkuk pipeline, constructed in the 1970s to bring 1.6 million barrels of oil per day to the Turkish Mediterranean port of Ceyhan.

 A bomb attack on June 21 kept the pipeline closed for much of July. A repair crew sent to fix the damage was ambushed by gunmen who killed two engineers and two police.

 In the end, Kirkuk oil shipments for this month averaged just 150,000 bpd, less than a tenth of official capacity.

 "Bomb attacks and leakages due to corrosion have made the pipeline unfit to handle steady shipments from northern oilfields," a senior official with Iraq's state-run North Oil Company .

 "The deterioration of security in areas where the line stretches has made it impossible for our crews to repair damage in time as we used to. Now it takes ages," said the official.

 "In recent meetings we told the oil ministry that Kirkuk's major export pipeline is now suitable for watering gardens and not for carrying oil."