Videos shared on social media showed Guinea’s President Alpha Condé being detained by army special forces on Sunday.
The videos, which could not be immediately authenticated, were posted following hours of heavy gunfire around the presidential palace in Conakry.
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In a short broadcast on state TV, soldiers who staged an uprising said they have dissolved the constitution and the government in the West African state.
However, the defence ministry said an attack on the presidential palace by mutinous forces had been put down. It said in a statement:
The presidential guard, supported by the loyalist and republican defence and security forces, contained the threat and repelled the group of assailants.
Security and combing operations are continuing to restore order and peace.
Heavy gunfire had broken out near the presidential palace in Conakry on Sunday morning, with several sources saying an elite national army unit led by a former French legionnaire, Mamady Doumbouya, was behind the unrest.
An unidentified soldier, draped in Guinea’s national flag and surrounded by eight other armed soldiers, said in the broadcast that they planned to form a transitional government and would give further details later.
Condé won a controversial third term in October after changing the constitution to allow him to stand again despite violent protests from the opposition, raising concerns of a relapse in a region that has seen coups in Mali and Chad in recent months.