Chad's President Idriss Deby called on the European Union on Thursday to deploy a peacekeeping force urgently to the east, as his government sought to tighten security after a weekend rebel assault. Prime Minister Nouradine Delwa Kassire Coumakoye announced a dusk-to-dawn curfew across the capital N'Djamena and swathes of east and central Chad after the remnants of the rebel column which attacked the city withdrew halfway to the Sudan border.