Chad is appealing for international help to end its crisis with neighbouring Sudan. It comes four days after what Chad says was a Sudanese-backed attack on its capital, N’Djamena. Calm has returned to the city as well as Abeche in the east of the country. French troops patrolling the city say the sight of people on the streets is a sign that all is well.The central Africa state has accused Sudan of trying to use the conflict in Darfur to destabilise the whole region. President Idriss Deby’s government has urged the UN to take control of Sudan’s violence-torn Darfur region and sanction the Sudanese government. Deby, who is standing for re-election next month, cut diplomatic ties on Friday with Sudan, which vehemently denies helping the rebels seeking to oust him. Since the Darfur conflict erupted in 2003, tens of thousands of people have been killed and around 2 million displaced.