Human Rights Watch report on Gatumba
"On August 13, 2004 a force of armed combatants, many of them members of the Forces for National Liberation (Forces pour la Liberation Nationale, FNL), massacred at least 152 Congolese civilians and wounded another 106 at Gatumba refugee camp, near Bujumbura, the capital of Burundi. The FNL is a predominantly Hutu rebel movement known for its hostility to Tutsi and the victims were largely Banyamulenge, a group often categorized with Tutsi...
...the FNL accepted responsibility for the attack but asserted that the refugee camp harbored Banyamulenge combatants preparing for a new war on Congo. Less well known in international circles, this version of events also spread widely, through informal channels of communication among FNL supporters and various groups in the Congo. Several civil society groups from apparently from South Kivu produced documents supporting this theory and circulated them by electronic mail...
...The Gatumba massacre was a direct attack on civilians in violation of international humanitarian law (the laws of war) for which all those responsible must be fully prosecuted. The Burundian government has issued arrest warrants for two leaders of the FNL, a promising first step that must be followed by the actual arrest and prosecution of the perpetrators...
...The first ONUB statement about the Gatumba massacre on August 14 denounced the slaughter but ended by calling on perpetrators of the attack to return to cooperating with all parties in the peace process. As public horror over the crime grew, the UN withdrew from this position and announced a suspension of talks with the FNL, apparently recognizing that even the hope of negotiating an eventual settlement to the war could not justify dealing with persons who accepted responsibility for such a crime."