A DAP lawmaker will lodge a report with the Malaysian Anti-Corruption Commission (MACC) against Inspector-General of Police (IGP) Khalid Abu Bakar if he refuses to probe the claim by Sirul Azhar Umar.

Klang MP Charles Santiago said a report will also be lodged against Khalid with the Enforcement Agencies Integrity Commission (EAIC) if the IGP maintains the same stance in a week's time.

"I'll give him a week. With (Prime Minister Najib Abdul Razak’s) statement today, it is now Khalid's responsibility to probe (Sirul's remarks)," he told Malaysiakini .

A police report was lodged by DAP MP Lim Lip Eng this morning, urging a police to probe Sirul’s claim that he acted under orders.

However, Khalid said the police require sufficient grounds to initiate a probe and the DAP report was based on hearsay reported in the media.

When attending the MCA open house this morning, Najib had dismissed Sirul’s claim that the former police commando acted under orders and that those with a motive to kill Altantuya Shaariibuu are still free.

The PM had described it as "utter rubbish".

Referring to a Malaysiakini interview, in which Sirul said he is considering revealing all about the murder, Santiago termed it as "explosive".

"Therefore, the police should not make an exception," he said, asking if the police were protecting certain people by not wanting to initiate a probe.

He said that Najib's statement implied that the prime minister "is in the know" regarding what had happened.

He also urged the judiciary to issue a stay of execution against both Sirul and another former police commando, Azilah Hadri, until Najib is questioned.

Both Sirul and Azilah were convicted with the 2006 murder and sentenced to death last month.

Sirul, however, fled to Australia before the verdict was announced and is being held in an immigration detention centre in Sydney.

Malaysia is attempting to extradite him but Australian law forbids sending back those who face capital punishment in their home countries.