A son of Angola's ex-President Jose Eduardo dos Santos has been arrested on suspicion of money-laundering, embezzlement of public funds and fraud.

Jose Filomeno dos Santos is the most high-profile person to be targeted in new President Joao Lourenco's campaign against alleged corruption.

He had been detained because of the "seriousness" of the allegations against him, Angolan prosecutors said.

He or his lawyers have not yet commented.

His Swiss-Angolan friend and business partner, Jean-Claude Bastos, was also arrested.

In a statement, the state prosecutor said it is in a "preparatory investigation phase" in relation to the management of Angola's $5bn (£3.8bn) sovereign wealth fund by the ex-president's son and Mr Bastos.

"The evidence gathered resulted in sufficient indications that the defendants have been involved in practices of [alleged] various crimes, including criminal associations, receipt of undue advantage, corruption, participation in unlawful business, money laundering, embezzlement, fraud among others," the state prosecutor added.

Jose Filomeno dos Santos was sacked as head of the sovereign wealth fund in January, months after a BBC investigation into the fund and following an internal governance review. (BBC)