Sudan’s President Omar al-Bashir has been ousted and arrested by the military after nearly 30 years in power.
Speaking on state TV, defence minister Awad Ibn Ouf said the army would oversee a two-year transitional period followed by elections.
He also said a three-month state of emergency was being put in place.
Protesters, however, have vowed to stay on the streets despite an overnight curfew being imposed by the military.
Demonstrations against Mr Bashir, who has governed Sudan since 1989, have been taking place for several months.
The protesters are now demanding a civilian council to lead the transition rather than a military one, correspondents say.
“I announce as minister of defence the toppling of the regime and detaining its chief in a secure place,” Mr Ibn Ouf said in a statement.
Mr Bashir’s exact whereabouts are not known.
Mr Ibn Ouf said the country had been suffering from “poor management, corruption, and an absence of justice” and he apologised “for the killing and violence that took place”.
He said Sudan’s constitution was being suspended, border crossings were being shut until further notice and airspace was being closed for 24 hours.