The Malaysian Anti-Corruption Commission has revealed a series of nine audio recordings of high-ranking officials, including former prime minister Datuk Seri Najib Razak.

The recordings are said to have taken place between Jan 5, 2016, and July 29, 2016.

One of the conversations was allegedly between Najib and his wife Datin Seri Rosmah Mansor where she was heard expressing her displeasure over a certain matter related to MACC investigations.