Why have Rwanda-backed rebels seized 2 Congolese cities and is there an end in sight? / Chaos and looting as Rwanda-backed rebels push toward eastern Congo's second major city / Rwanda-backed rebels have seized another town in eastern Congo / Arsenal accused over 'blood-stained' Visit Rwanda deal as war escalates in DR Congo / Congolese army fights to repel Rwanda-backed rebels in fighting that has killed some 700 people / Fear and gunshots after Rwanda-backed rebels claim takeover of eastern Congo's largest city / Rwanda-backed rebels seize key town in DR Congo / Though Rwanda has come a long way since the 1994 genocide, scars of the past still haunt the nation