It has been learnt that the investigation into 1MDB's dealings with Abu Dhabi wealth fund International Petroleum Investment Company (IPIC), which saw the former prime minister Najib Abdul Razak grilled twice by MACC this month, made progress following information obtained from a person involved in the matter.

The person, who carries a "Datuk" title, was appointed by Najib as an intermediary between the two companies some years ago, a source with the knowledge of the investigation told Malaysiakini...