MH370 Inspector-general of police Khalid Abu Bakar has refused to respond to the contradictory versions given by the authorities on the stolen passports used by two Iranians to board MH370.

"Why ask me? Ask Immigration, or ask Interpol," Khalid said when asked on the matter.

"I think today... I do not wish to state anything about the investigations (regarding the Iranians)," he told reporters late last night.

The Immigration Department has said the two men entered Malaysia with stolen Italian and Austrian passports.

Interpol announced that the two used Iranian passports to enter Malaysia and then used the stolen passports to board the MAS plane bound for Beijing on March 8.

News of the stolen passports has sparked concern that the aircraft may have come under a terrorist attack.

However, Khalid told the media yesterday that checks revealed that the two Iranians had no terror links.

Earlier yesterday, Immigration director-general Aloyah Mamat also declined to comment on the conflicting versions.

Aloyah told a press conference that her officers had adhered to the standard operating procedure in allowing the two men into the country.

The department has drawn flak over the issue, with Home Minister Ahmad Zahid Hamidi promising to conduct a probe.