Guinea has been suspended from the West African regional bloc Ecowas following the coup that overthrew President Alpha Condé on Sunday, Burkina Faso’s Foreign Minister Alpha Barry has said.
The bloc also demanded Mr Condé’s release from custody, he added.
Leaders of the 15-nation bloc held a virtual meeting to discuss the coup waged by elite troops led by the 41-year-old Col Mamady Doumbouya.
He accused Mr Condé, 83, of rampant corruption and human rights abuses.
The deposed president’s whereabouts are unclear, although the coup leaders have said he is safe.
Guinea is one of the world’s biggest producers of bauxite, the raw material for aluminium, and prices have leapt to a 13-year-high following the coup.
Many of those released were arrested last year during massive nationwide protests against Mr Condé’s plan to stand for a third term.
The BBC’s Alhassan Sillah in the capital, Conakry, says the most prominent of the freed prisoners was Oumar Sylla, known as Foniké Mengué, who went on hunger strike last December.
“I feel free, free, free, thank you to the people,” said Ismaël Condé, a member of the opposition UFDG party, and no relation to the former president.
He said his time in prison had been difficult, but he was now hoping for a better future for his country:
“It’s a feeling you can’t explain, to be deprived of your freedom for 12 months for such trivial things and to be released under these conditions, you can’t explain,” he said.
On Tuesday, Guinea’s main opposition leader expressed support for the coup, describing it as an opportunity for a new beginning.
Cellou Dalein Diallo said the army’s junta was historic, but called on them to foster national reconciliation.
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.