The military-led government in Chad says 50 people have been killed and more than 300 others wounded in a day of protest demanding a transition to democracy.
Newly appointed Prime-Minister Saleh Kebzabo says some of the protesters were armed.
Among those killed were members of the security forces. The government has announced a curfew in the capital and two other towns affected by the protests.
The authorities has however announced that an investigation will be launched into the situation.