Sudan says it has thwarted an attempted military coup, and arrested "all those involved".
A government spokesman told state media the coup plotters were linked to the ousted President Omar al-Bashir, who was toppled two years ago.
Earlier reports from the capital Khartoum and nearby Omdurman described intense military activity, and the main bridge across the River Nile was shut.
The road to Khartoum and ports have also been blocked.
The plotters had tried to take over a building housing the state media, AFP news agency reports.
A government involving the military, civilian representatives and protest groups is in place, was established as part of power-sharing agreement after President Bashir was ousted in 2019.