Violence and looting broke out overnight in capital city Bangui after Michel Djotodia stepped down as president, leaving at least three people dead.
A West African military force assembled to intervene against Islamic radicals in Mali is ready to be deployed as soon as the UN issues a green light.
Police have fired tear gas to disperse a rally on a central Tunis avenue where demonstrations are banned.
The situation in eastern Chad, a region plagued by rebel incursions and refugee crises, has taken a dramatic turn for the worse as a rebellion against President Idriss Déby Itno gathers force, aid workers say. Rebels from the United Front for Change (FUC) left their base in the east last week and three days later launched their biggest offensive yet on N'djamena.