Coney the LRA killed more than 10 people

The guerrilla group led by Joseph Kony, whose global notoriety was increased by the Invisible Children internet video, is also blamed for the abduction of between 60,000 and 100,000 children and the displacement of 2.5 million people.

Ban said in a report on Central Africa that the office of High Commissioner for Human Rights Navi Pillay had researched the death toll as part of a study on the impact of the LRA since 1987, which is due out soon.

"The report finds that the LRA is responsible for more than 100,000 deaths and that between 60,000 and 100,000 children are believed to have been abducted" by the LRA, Ban said.

Kony, a former church altar boy, originally launched an uprising against the Ugandan government in the 1980s. His group has since staged attacks in several countries.

He is wanted by the International Criminal Court for war crimes and is believed to be hiding in jungles on the border between Sudan, South Sudan, the Democratic Republic of Congo and the Central African Republic. But conflict in the region has brought an international hunt for Kony to a near standstill.

While the intensity of the guerrilla attacks has eased, Ban said "suspected LRA attacks continued to be reported in remote border areas" of the Central African Republic and DR Congo.

His report said the LRA was blamed in 2012 for about 212 attacks that left 45 dead, while another 220 people were abducted, a quarter of them children. The guerrillas are accused of using their hostages as sex slaves and porters.

The UN report said more suspected attacks had been reported in 2013, with additional casualties and abductions, but it did not give a figure.

The Kony2012 internet video produced by the Invisible Children activist group has been viewed almost 100 million times since March last year.