The journalist was arrested on Sunday in the capital, Conakry, while investigating alleged corruption in the country's National Oil Company (Sonap).

Sources say the journalist was interested in how certain officials of Guinea's transitional government had acquired their wealth and had been in the country for several days to investigate Sonap.

It is not the first time Mr Dietrich is arrested in Guinea.

In March 2020, he was arrested and deported after he filmed a police crackdown on an opposition demonstration in the capital Conakry.

It is not clear if Mr Dietrich has been deported following his latest arrest.