Chad closes its border with Sudan

Chad has closed its border with Sudan and suspended economic ties.

The move comes a day after Sudan cut diplomatic relations with Chad following a rebel attack near the Sudanese capital, Khartoum.

The Sudanese authorities accused Chad of helping a Darfur rebel group attack the city of Omdurman outside Khartoum - a charge Chad denies.

Earlier, Sudan released an opposition leader, Hassan al-Turabi, who had been accused of involvement in the attack.

The Darfur rebel group, the Justice and Equality Movement (Jem) attacked Omdurman, Khartoum's twin city across the River Nile, on Saturday.

The raid was the closest they had come to the capital in five years of conflict in Darfur.