A top leader of Uganda's Lord's Resistance Army (LRA) rebels and his fighters have left an assembly point agreed under a truce in south Sudan, in violation of a ceasefire, an army spokesman said on Wednesday, according to Reuters. "We have just got credible information that the rebels who had assembled at Owiny-Ki-Bul dispersed two days ago," Major Felix Kulayigye told reporters, referring to the camp in south Sudan. "We don't know where Dominic Ongwen and his men are now headed, but we think it's a gross violation of the cessation of hostilities." Ongwen is one of five LRA leaders wanted by the International Criminal Court in the Hague for war crimes in a 20-year insurgency in northern Uganda that has killed tens of thousands and displaced nearly 2 million. Under a landmark truce signed last month with Uganda's government, the LRA agreed to assemble at two camps in neighbouring south Sudan as peace talks continue in its capital Juba.