State television in Sudan has said there has been a failed coup attempt.
"There has been a failed coup attempt, the people should confront it," state media reported, but did not identify the plotters.
Reports from the capital city Khartoum and nearby Omdurman say there has been intense military activity, and bridges across the River Nile have been closed.
AFP quotes a government source saying the plotters had tried to take over the state media building but "they failed".
Video on social media appears to show armoured vehicles on city streets.
The government is reported to have said measures are being taken to contain the situation.
According to Reuters, military spokesman Mohamed Al Faki Suleiman says the interrogation of suspects will soon begin.
Two years ago, the country's long-term ruler Omar al-Bashir was toppled. A power-sharing agreement then established a government involving the military, civilian representatives and protest groups.
Latest Stories
-
Hindsight: Dreams fairytale run proved one thing; it is possible
43 mins -
God makes rulers, not you; you can’t choose your successor – Mahama to Akufo-Addo
2 hours -
Contributors own SSNIT, they must decide who becomes its Director-General – Austin Gamey
2 hours -
Move away from theory-based learning towards practical learning approaches – AUCC President to students
3 hours -
Haaland scores as Manchester City beat Nottingham Forest
4 hours -
Villas-Boas elected Porto president
4 hours -
Situation on frontline has worsened, Ukraine army chief says
4 hours -
US doctor describes witnessing starvation in northern Gaza
4 hours -
CAFCC: RS Berkane make final after USM Alger refused to play 2nd leg over Moroccans’ jersey
4 hours -
Elon Musk in China to discuss enabling full self driving
4 hours -
PSG clinch Ligue 1 title after Lyon’s win over Monaco
6 hours -
Guinness Ghana sets the pace at Ghana Beverage Awards with six awards
7 hours -
Burkina Faso suspends BBC, VOA radio broadcasts over killings coverage
7 hours -
Nicole Kidman honoured with AFI Life Achievement Award
7 hours -
Brassier scores winner for Brest as they edge Rennes to secure European football
7 hours