Unidentified armed groups attacked a convoy of 51 fuel tankers and set them on fire on the highway between Baiji and Samarra.
The tankers were loaded with oil products from the country’s main refinery complex in Baiji and were reported to be on their way to the rebel city of Ramadi west of Baghdad.
Both Baiji and Samarra are rebel hideouts and armed groups have conspicuous presence in the area.
The two cities control the highway leading to the refineries and the Turkish borders.
The whole area stretching from Baghdad to Mosul, 400 kilometers to the north of the capital, is extremely dangerous.
Rebels frequently attack fuel convoys as well as pipelines and oil installations.
Their attacks have almost put out of order the twin pipeline which used to carry nearly 1 million barrels of oil to Turkish Mediterranean terminals under former leader Saddam Hussein.
Baiji is also the site of major power generation plants and but rebel attacks on pylons and supply lines as well as the plants themselves have reduced out to minimal.