Police may summon former prime minister Najib Razak to probe the latest accusation that he instructed the murder of Mongolian national Altantuya Shaariibuu, according to Inspector-General of Police Abdul Hamid Bador.

He said tens of individuals will be summoned.

"Tens of individuals, all of them," Hamid told a press conference when asked if Najib would be summoned.

Last Monday, Malaysiakini reported that former Police Special Force officer Azilah Hadri had applied for a review of his murder conviction in Federal Court.

In his statutory declaration, Azilah admitted, for the first time, that Najib had given instructions for him to kill Altantuya.

Azilah also alleged Najib convinced him that Altantuya was a foreign spy who posed a threat to national security.

In 2015, the Federal Court overturned the Court of Appeal's decision to acquit Azilah and another former UTK personnel Sirul Azhar Umar.

However, Sirul had fled to Australia after his acquittal and is currently in an immigration detention centre in Sydney.

Last week, Najib performed a sumpah laknat denying that he ordered the murder of Altantuya.

Abdul Hamid said police have summoned a few witnesses to assist the investigation.

He said the police are not silent on any case that affects the issue of security and will take action accordingly.

In the meantime, he said police are waiting for any possible instruction from the Attorney-General's Chambers.

(More to follow)