( CNN ) -- A December rampage that killed hundreds in the Democratic Republic of Congo went largely unreported because of lack of communications in the remote area , a United Nations official said Sunday . The Lord 's Resistance Army carried out the brutal campaign in northeastern Congo over four days , killing at least 321 , according to a report by Human Rights Watch . Rebels also abducted 250 others -- including at least 80 children -- when they attacked villages in Makombo area , the human rights group said Saturday . Alan Doss , a United Nations Special Representative for Congo , confirmed the massacre and said the world body was made aware of the attacks in December and confirmed some deaths in January . `` The area is remote , there 's no intelligence or communications , we had to cross check , '' Doss said . The United Nations can not corroborate the number of deaths reported by Human Rights Watch , but has confirmed more than 100 killed so far , he said . `` The area is the size of Spain , '' Doss said . `` It has no infrastructure ... we are working on efforts to get better communications to make it less isolated . '' The Lord 's Resistance Army was initially based in Uganda , but now works near the borders of Central African Republic , Sudan and Congo . It has been accused of killing , abducting and mutilating scores of people in the past . In the Congo attack , gangs tied up villagers -- including women and children -- and hacked them to death , Human Rights Watch said . They also crushed their skulls with axes and heavy wooden sticks , the report said . The anti-Ugandan government rebel group is led by self-declared prophet Joseph Kony . It claims its insurgency aims to replace the Ugandan government with a democracy based on the Ten Commandments . President Yoweri Museveni pushed it out of Uganda in 2005 . Five years ago , the International Criminal Court issued arrest warrants for senior rebel leaders for crimes in northern Uganda , but those indicted remain at large . The Makombo massacre is the deadliest documented attack by the LRA since rampages around Christmas 2008 left scores of Congolese dead . Dozens of other attacks against civilians have been carried out in other areas in recent months , Human Rights Watch said .
A rebel group in Congo abducted at least 20 civilians , Human Rights Watch said . The Lord 's Resistance Army abducted 250 others including 80 children , the report said . LRA forces attacked at least 10 villages from December 13 to 17 , the report claimed . United Nations said it was made aware of the attacks in December .