At least four civilians died and eight others were wounded when a roadside bomb exploded as the vehicle they were riding in passed by in the southern Afghan province of Uruzgan, officials told Efe.

The incident occurred on Saturday in the Chambarak area. Among the dead are a woman and a child and among the injured are four children, provincial government spokesman Abdullah Himmat said.

Roadside bombs, also known as improvised explosive devices, or IEDs, are - along with suicide attacks - the methods most often used by the Taliban insurgents to strike at Afghan and international security forces, although in practice they cause a high number of civilian casualties.

The war in Afghanistan, according to a U.N. report published in February, during 2012 took a total of 2,759 civilian lives and wounded 4,805.

The greatest threat to civilians in Afghanistan last year were IEDs, which killed 868 civilians and wounded 1,663, the report said.

The process of withdrawing international troops from Afghanistan is under way and is slated to conclude in 2014 if the established schedule is adhered to. EFE