The probe by the Malaysian Anti-Corruption Commission (MACC) on the RM2.6 billion political fund received by Prime Minister Datuk Seri Najib Tun Razak will take some time as it involved foreign transactions and witnesses.

As such, Deputy Minister in the Prime Minister's Department Datuk Razali Ibrahim called on all parties to not make any speculation on the case.

He said further investigation was being conducted by the commission to determine if there was an offence committed under the MACC Act 2009.

Najib will also be called to give his statement to complete the investigation and he, himself had issued a statement on the matter, said Razali said when winding up the debate on the 2016 Supply Bill in the Dewan Rakyat today.

Razali said although investigation was still not completed, the MACC had confirmed that the RM2.6 billion was a donation and not from 1Malaysia Development Berhad (1MDB).

He said normally, the MACC would not make any announcement on cases under investigation.

"In this (RM2.6 billion fund) case... an announcement had to be made because the donation was not from 1MDB," he added.