Namibia's state-owned telecoms company has fallen victim to what is known as a ransomware attack resulting in the leak of sensitive customer data, including reportedly information about top government officials.

Telecom Namibia said the data had been released after it refused to engage with a group of hackers known as Hunters International.

The company said that it is now investigating how such a massive breach of its system occurred.

Outgoing President Nangolo Mbumba has condemned the cyberattack.