The Angolan attorney general says the former governor of the capital, Luanda, is being investigated on corruption charges.
Higino Carneiro, who has been barred from leaving the country, is accused of embezzlement, corruption, abuse of power and money laundering while governor of the city.
Mr Carneiro was appointed to the role by President Jose Eduardo dos Santos, who stepped down two years ago after nearly four decades in power.
President dos Santos’ successor, Joao Lourenco, has vowed to tackle the corruption which allegedly took place during his predecessor’s rule.