DR Congo massacre unveiled
The previously undocumented massacre, undertaken over four-days in the remote Makombo area of the northeastern Haute Uele district, was highlighted in reports by Human Rights Watch (HRW) and the UN on Sunday.
The killings of 321 civilians occurred between December 14 and 17, HRW said in a reportafter documenting the deaths in a visit to the region in February.
The Ugandan anti-government group were said to have abducted 80 children among the 250 people kidnapped.
"The Makombo massacre is one of the worst ever committed by the LRA in its bloody 23-year history, yet it has gone unreported for months," Anneke Van Woudenberg, HRW's senior Africa researcher, said.
"The four-day rampage demonstrates that the LRA remains a serious threat to civilians and is not a spent force, as the Ugandan and Congolese governments claim."
The UN also said on Sunday that their investigation had shown that the LRA had killed at least 290 people, perhaps more than 300, during the rampage and following LRA threats of such massacres the year before.
"The men were tied by the chest by the same rope and killed with wood sticks on the back of the head and neck - it was really brutal and fast," Liliane Egounlety, who led the UN investigation, said.
"They also used machetes. Many witnesses found it too hard to talk about."
The UN said that at least 150 people had been abducted.
HRW's investigation found that the LRA had made some of the 80 abducted children murder other children.
The LRA has a reputation of forcing children into becoming soldiers.
HRW said that the attacks in at least 10 villages were well planned, targeting men first, but also killing women and children.
The group said that the youngest person to die was a three-year-old girl who was burned to death, while at least 13 gangs and 23 children were killed.
Their document said that some people were killed by having their heads smashed with axes and heavy wooden sticks.
The LRA was formed in northern Uganda in the late-1980s as a rebel group.
In 2005, they were forced out of the east African country to the Democratic Republic of Congo (DRC), Central African Republic and south Sudan, from where they continued to launch cross-border attacks.
LRA fighters killed 1,200 people and kidnapped 1,400 others - including 630 children and more than 400 women - in the DRC during a 10-month period in 2008 and 2009, the UN has said.
Van Woudenberg said that the LRA had become a regional problem that needed action by the United Nations and African governments.
"What it does show is that it is high time for the Lord's Resistance Army leaders to be arrested, for them to be brought to justice and these kind of atrocities to end," she said.
"I think what is needed is some bold leadership, some really courageous steps taken by the governments of the region, by the United Nations peacekeeping forces to put together an regional strategy to end the terror of this group."
A much-criticised UN mission remains in the east of DR Congo but is under pressure to leave the country by next year, when presidential polls are due to be held.
It has about 22,000 soldiers in the region to keep peace in the face of Rwandan Hutu fighters.
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