Sudan's prime minister and most of his cabinet members have been arrested in a reported military coup.
Pro-government party leaders have also been detained in the apparent takeover by the military, throwing the fledgling democracy into disarray.
Prime minister Abdalla Hamdok has been moved to an unknown location after refusing to share a statement in support of the coup.
He was being held under house arrest and faced pressure from military forces to back the takeover.
It comes two years after the country's former autocrat Omar al-Bashir was overthrown and a transitional government was established following large-scale protests.
It is not yet clear who is behind the latest coup.
Mr Hamdok has now called on the Sudanese people to resist the coup attempt peacefully and "defend their revolution", the information ministry said.
Omar al-Bashir was arrested in 2019 after stepping down following a coup sparked by months of protests.
In a statement broadcast on state TV, Defense Minister Awad Mohamed Ahmed Ibn Auf said a military council would run the country for a two-year transitional period.
There will be elections at the end of the transitional period, he added.
"The armed forces will present an important statement shortly. Be ready for it," state television said, as protests demanding Omar al-Bashir step down escalated.
The coup took place after persistent demonstrations sparked by attempts to raise the price of bread, and an economic crisis that led to fuel and cash shortages.
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