Former Batu Kawan Umno vice-chief Khairuddin Abu Hassan has lodged a police report on the misappropriation of funds from 1MDB following the US Department of Justice's (DOJ) forfeiture lawsuits seeking to return US$1 billion assets allegedly stolen from the state fund.

Khairuddin, who is one of former prime minister Dr Mahathir Mohamad's lieutenants, said that the DOJ had named four Malaysian citizens in their lawsuits, that is, businessman Low Taek Jho (also known as Jho Low), his associate Eric Tan, Prime Minister Najib Abdul Razak's stepson Riza Aziz and the unknown 'Malaysian Official 1'.

He said he has also examined the DOJ document where they detailed the misappropriation of funds by 1MDB officials to purchase assets overseas, including in the US, UK and Switzerland.

As such, he urged the police to look into these transactions and the individuals named in the lawsuit.

"As a concerned citizen, I want to make an official report asking the police to do a thorough and complete investigation on these transactions involving misappropriation of 1MDB funds and also on the individuals named," he said in his police report, lodged at the Dang Wangi police district headquarters late last night.

Based on the descriptions provided in the civil suits, Khairuddin also said he was certain that 'Malaysian Official 1' is Najib.

Prior to the DOJ lawsuits, he said that there had been many 1MDB scandals and exposé by various individuals but no action had been taken against any members of the board of directors or officers within 1MDB.

The DOJ has cracked down on alleged misappropriation of 1MDB funds, through the use of civil suits on July 20.

The DOJ claimed that more than US$3.5 billion had been diverted from 1MDB over the course of several years, to the benefit of several individuals including an unnamed high-ranking public servant dubbed 'Malaysian Official 1'.

Last September, Khairuddin was arrested and detained for a full 28 days under the Security Offences (Special Measures) Act 2012 (Sosma) for allegedly attempting to sabotage the country after he travelled to several countries with his lawyer to lodge reports on 1MDB.