At least four children including two boys and two girls have been killed in a roadside bomb attack in Afghanistan’s southern province of Kandahar, police officials say.

According to a statement released by Kandahar police chief Abdul Razaq on Tuesday, the explosion happened a day earlier in province’s Marof district as the kids were collecting fire woods. At least two other kids including a girl and a boy were also injured during the incident, the statement added. Reports say that the Afghan kids were all from the same family. Roadside bombs and improvised explosive devices are by far the most lethal weapons Taliban militants use against Afghan forces, foreign troops, and civilians. Violence continues to plague Afghanistan despite the presence of thousands of foreign forces, more than a decade after the US - led invasion of the country in 2001. In the first six months of 2012, over 1,140 Afghan civilians were killed and around 2,000 were wounded, mostly by roadside bombs, according to statistics released by the United Nations. Thirty percent of the casualties were women and children.