The convoy, carrying aid workers, medical supplies and water, is heading through the North Kivu province to Rutshuru, a town captured last week by rebels loyal to renegade Tutsi general Laurent Nkunda. He has declared a ceasefire, which is reportedly holding, but there were fears that he is about to launch a major offensive to take the provincial capital Goma. He argues that his army is defending Tutsis against Hutu extremists.