At least four civilians and two police officers died Monday when two bombs exploded in two separate incidents in southern Afghanistan, police told Efe.

One of the blasts, which killed four civilians and wounded two more, occurred in Helmand province, according to a regional police source, who requested anonymity because he was not authorized to speak to the press.

The other bomb exploded on the outskirts of the town of Trinkot, in Uruzgan province, killing two police officers and wounding a third, according to provincial police spokesman Farid Ayel.

Improvised explosive devices, or IEDs, are, along with suicide attacks, the methods used most by the Taliban to strike Afghan and international forces, although in practice they tend to cause a high number of civilian casualties.

According to a U.N. report, 2,759 civilians were killed and 4,805 wounded during 2012 in the war in Afghanistan.

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

The process of withdrawing international troops is under way in Afghanistan and is slated to be concluded in 2014. EFE