At least 30 people were also wounded, including members of the police force in Conakry, the government yesterday said in a statement.
A number of violent protests have rocked the city in the past few weeks, mainly by young people and students who support a teachers' strike.
Teachers' unions are demanding that contracted teachers, who are not full time, be fully integrated in the public school system. They are also asking for a higher salary and better working conditions.
But unions called for a strike, which was still in effect yesterday in the capital and in other parts of the country, teachers and other witnesses told AFP.
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"Our capital was the scene of unauthorised and illegal protests by the governor of the city of Conakry" to demand that schools reopen, the government said in a statement.
The protests were marked by "acts of violence, of vandalism" even though the night before, a deal had been reached "with the unions after many days of negotiations."
Another young man was hit by a bus as he tried to flee the violence, a police official said.
At least 12 people were arrested and some ambulances and public health centres sustained damage.
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