(File Photo: AP)

Besides the amount of 143.75 million ringgit due to be paid by 1MDB on May 30, Lim said another 810.21 million ringgit worth of interest is due between September and November, 2018.

The Malaysian police also seized a trove of cash, jewelry and designer handbags from several premises related to Najib, including his private residence and luxury condominiums, as part of a corruption probe following the election.

But Shukri did not elaborate on the relevance between the 1MDB investigation and the search, saying it should be answered by the police.

Shukri did not specify how long the investigation will last. He said it will depend on the documents. "If we feel satisfied we can release him. If we need his statement, we will call him back," he said.

Najib, who went into the MACC building at around 9:45 a.m. local time, came out at around 3:00 p.m. in the afternoon. He praised the professionalism of MACC officers and said he will come back on Thursday to continue. Najib denied any wrongdoing related to 1MDB during his premiership.