Nearly four years after the opening of its investigations in the Democratic Republic of Congo, the International Criminal Court (ICC) is officially searching a fourth suspect there.

Bosco Ntaganda, who is "around 35", has a full résumé: a Congolese Tutsi, he was barely of age when he joined the Rwandan Patriotic Army and participated in the conquest of Kigali during the 1994 genocide.

Back in the Congo, he became head of military operations for the military arm of the Union of Congolese Patriots (UPC), the movement led by the first ICC defendant, Thomas Lubanga. In that capacity, Ntaganda participated "in numerous massacres" according to Human Rights Watch: a "systematic massacre of Lendu and Ngiti civilians" in the village of Songolo in August 2002; a "man hunt" killing "at least 100 people" in Bunia; and the attack on the gold-mining village of Mongbwalu in November 2002, in which "at least 800 civilians were killed".

Despite that, the ICC is only accusing Ntaganda, like Lubanga, of conscripting child soldiers. His arrest warrant, issued in August 2006, was only made public on April 28, two months after the signing of an agreement in Goma between the government and 22 armed groups, including the National Congress for the Defense of the People, of which Ntaganda is today the military chief of staff.

"If [the leader of this movement] Laurent Nkunda is truly committed to the Goma peace agreement, then he should immediately deliver Ntaganda to the international court," said Anneke van Woudenberg, a senior researcher with Human Rights Watch, in a press release.