Ethiopia has been subject to guerrilla operations since 1976, when the Oromo Liberation Front (OLF) challenged the central administration ostensibly on behalf of the majority Oromo ethnic group. Various other secessionist and ethnic factions have subsequently raised arms against the government, for example the Ogaden National Liberation Front (ONLF) and its armed wing the Ogaden National Liberation Army (ONLA), at times resorting to urban terror bombing. Following the resolution of the Ethiopia–Eritrea war in 2000, the government stepped up its efforts to eliminate the rebels. But, after disputed elections in 2005, rebel activity and military operations to curtail it have increased. Peace talks between ONLF and the Ethiopian government stalled in October 2012. Restrictions on media in Ethiopia mean that events in Ogaden and Oromia are difficult to follow. Human rights organisations regularly accuse Ethiopia and its armed forces of grave human rights violations in the two regions, however.