President Alpha Conde has been arrested in connection with the coup, according to a statement in a video from the coup makers sent to the news agency AFP.
In another video, the president is seen on a sofa surrounded by soldiers.
At the same time, the government states that an attack on the presidential palace has been repulsed and that security forces are restoring order.
"Much more important"
Residents in Conakry have testified that they heard heavy gunfire earlier on Sunday.
- We feel safe.
But they prefer that we should be able to leave here, says Aly Keita to Aftonbladet.
- I'm here to play football and had hoped to do it tomorrow here in Guinea.
It's a shame.
But the most important thing is that people feel good.
It is much more important than football, he says.
The World Cup qualifier between Guinea and Morocco was supposed to be played on Monday but has been postponed.
"The political and security situation in Guinea is currently quite unstable and is being closely monitored by the International Football Association (FIFA) and the African Football Confederation (CAF)," Fifa said in a statement.
To be evacuated
Morocco's national team is still in a hotel some distance away from the events, but they are working to be able to evacuate the team on Sunday.
- There is already an aircraft ready at the airport, says Mohamed Makrouf at the Moroccan Football Association, according to AFP.
The Moroccan national team includes Paris Saint-Germain defender Achraf Hakimi, Sevilla's Youssef En-Nesyri and Benfica's Adel Taarabt.
Liverpool midfielder Naby Keita is Guinea's big star.
In addition, both Östersund's goalkeeper Aly Keita and the former Malmö FF player Pa Konate play in the national team.