80,000 flee Abyei - South Sudan
Fears rise that Sudan could return to full-blown conflict, which could have a devastating impact by sending refugees back across borders and creating a failed state in the south
Rain, insecurity block access to Sudan's displaced
Heavy rainfall adds to risks for displaced Sudanese
No Abyei war, says south Sudan before independence
President Salva Kiir calls on north Sudan to withdraw its forces from the disputed region