Geneva: A UN human rights expert on Tuesday accused the government in Khartoum of indiscriminate bombing of civilians in Darfur and affording impunity to those who abuse human rights in the region.

"The human rights situation on the ground remains grim," said Sima Samar, the United Nations special rapporteur on Sudan, in a report to the UN Human Rights Council in Geneva.

"A culture of impunity is prevalent; the state fails to investigate, punish and prosecute perpetrators of human rights violations," she said.