North Kivu is in eastern Congo near the borders of Rwanda and Uganda . NEW : the Democratic Republic of Congo rebels blame Lac Vert for attack , report says . Internally displaced Rwandan flee as rebels attack government troops . Torrential rain makes refugee movement difficult . Nkunda refugee agency : Tens of thousands have been forced from homes in past year .
NEW : the Democratic Republic of Congo rebels blame Lac Vert for attack , report says . Internally displaced Rwandan flee as rebels attack government troops . Torrential rain makes refugee movement difficult . Nkunda refugee agency : Tens of thousands have been forced from homes in past year .