Sudan President Omar al-Bashir has been ousted and arrested.
In a televised address, the country's Defence Minister Awad Mohamed Ahmed Ibn Auf said the leader has been arrested and kept in a safe place.
"The supreme committee decided to implement what was not in the mind of other people and for a transitional period of two years the armed forces will take power with the representation of the people to pave the way for the people," he said, announcing that an election will be held at the end of the period.
"For a long time, examining what's going on in the state and the corruption that is going on... the poor are poorer and the rich are still rich and there are no equal chances for the same people."
The Sudani airspace and border crossings will be closed for 24 hours until further notice, he said, adding that a state of emergency will be in place for three months.
Earlier, Sudan's National Intelligence and Security Service announced the release of all political prisoners across the country.
Thousands have been camping outside the army headquarters.
A Russian attack on Ukraine's southern Odesa region killed two people and injured three overnight, Ukraine's emergency service and a government official said on Monday.
Children across parts of the US Northeast will stay home on Monday as a powerful winter storm forced school closures and pushed offices and transit systems onto emergency schedules, with officials across the region warning of dangerous travel conditions.
A passenger bus, headed to the Nepali capital city of Kathmandu from the tourist town of Pokhara, fell from a hilly road before dawn on Monday, killing 19 people, police said.
Human rights are under assault worldwide, the United Nations chief warned on Monday, citing widespread abuses of international law and devastating civilian suffering in conflicts in Sudan, Gaza and Ukraine.
One of Mexico's most notorious drug lords, Nemesio Oseguera, or "El Mencho", has been killed in a military raid on Sunday, sparking widespread retaliatory violence.