Huge sums of money from the fund are believed to have been funnelled round the world in a complex web of transactions, and the task force's remit will include reaching out to law enforcement agencies in other countries, including the US, Switzerland, Singapore and Canada, according to Mahathir's office.
Chief Commissioner Mohd Shukri Abdull speaks during a news conference in Putrajaya, Malaysia May 22, 2018. Najib has denied any misconduct related to 1MDB and was cleared by the attorney-general at the time.
Shukri was the deputy chief of the MACC under Najib, and spearheaded the investigation into what happened to the billions of dollars that were embezzled out of the 1MDB government fund, which was set up and overseen by Najib in 2009.
Shukri said he had called Najib into the agency to record a statement, not to arrest or charge him.
"I was sent a bullet to my house".
Television and press reports of police carting away the former first family's personal belongings raised objections from Najib's wife.
"I am amazed that even though I am no longer the prime minister, there are so many people at this event", he said during a ceremony opening a branch office of his United Malays National Organisation (UMNO).
The focus is on the asset recovery to bring back all the money and asset revenue from the 1MDB case offence.
The MACC is "trying hard" to get cooperation from countries including United Arab Emirates, Qatar and Saudi Arabia to access overseas statements, as it only has domestic documents at the moment, Mohd Shukri said.
Since losing power, Najib and his wife, Datin Seri Rosmah Mansor, have suffered a series of humiliations, starting with a ban on them leaving the country, and then police searching their home and other properties.
Malaysia's Anti-Corruption Commission has summoned Razak for questioning on Tuesday over the 1MDB case.
SRC International was a subsidiary of 1Malaysia Development Berhad (1MDB) before it was placed under the Finance Ministry in 2012.
The man who headed the first investigation into Malaysia's 1MDB scandal has said that he "almost died" whilst carrying out the probe, and was forced to flee the country after officers working for him were incarcerated, witnesses disappeared and he had multiple threats on his life.
The U.S. filed forfeiture complaints in 2016 and 2017 seeking to recover over $1.7 billion in assets traceable to funds allegedly misappropriated from 1MDB.