Kazakhstan has detained Nurlan Zhakupov, chairman of the management board of sovereign wealth fund Samruk-Kazyna, and Yelzhas Otynshiyev, head of national railway company Kazakhstan Temir Zholy (KTZ), in a corruption investigation.

The National Security Committee confirmed that its Anti-Corruption Service carried out the arrests on November 11. Several other individuals suspected of involvement in corruption have also been detained, according to gov.kz.

Investigative proceedings are currently underway to establish all the circumstances of the case.

The National Security Committee said it could not disclose further details about the pretrial investigation, referring to Article 201 of Kazakhstan's Criminal Procedure Code.

Samruk-Kazyna is one of Kazakhstan's most influential state institutions, managing assets and stakes in some of the country's largest companies.

Its portfolio includes major strategic enterprises such as KazMunayGas, Kazakhstan Temir Zholy, Kazakhtelecom, Samruk-Energy and Kazatomprom.

The sovereign wealth fund plays a central role in Kazakhstan's economy, overseeing businesses across the energy, transport, telecommunications and nuclear industries.

The investigation is ongoing.