North and south Sudan have agreed to set up a demilitarised zone along their shared border, as the south moves closer to independence. The announcement, made by the African Union (AU) on Tuesday, comes 10 days after the north seized the disputed Abyei region, prompting tens of thousands of people to flee. Alex de Waal, an AU adviser who has facilitated negotiations on security issues between Sudan's north and south regions, said the parties agreed to the move on Monday during talks in Ethiopia's capital, Addis Ababa.