In a broadcast on state TV on Sunday night, a group of soldiers announced the dissolution of the constitution, the closure of the borders and a nationwide curfew.
They said regional governors had been replaced by military commanders, and the ousted 83-year-old president was safe but in detention.
Coup leader Col Mamady Doumbouya said his soldiers had seized power because they wanted to end rampant corruption, human rights abuses and mismanagement.
Guinea’s coup is the fourth time West Africa has witnessed an attempt to undermine democracy in the region since August 2020. There have been two military takeovers in Mali and a failed attempt in Niger.