The father of a brutally murdered Mongolian woman today hit out at the Malaysian government after a delay in his daughter's murder trial, saying he feared political interference.

In one of the most charged cases in recent years, a High Court on June 4 began a trial over the murder of Altantuya Shaariibuu, who was killed and then blown up with explosives in October last year.

But the trial was swiftly postponed to June 18 after a new government prosecutor was introduced on the day, a move criticised as irregular by lawyers observing the case.

"It is not any toy or game for whomever wants to join or to make his career better," a frustrated Shaariibuu Setev told reporters, speaking through a translator.

"After eight months of preparation, it seems like there is a lack of preparedness," he said.

Altantuya's married lover, Abdul Razak Baginda, a political analyst and close associate of Deputy Prime Minister Najib Razak, is charged with abetting the crime, while two police officers are charged with the murder.

Najib, who is also Malaysia's defence minister, has vehemently denied any involvement.

'She knew too much'

Shaariibuu said the Malaysian government had ignored letters from the Mongolian government pleading for transparency in the trial, and also alleged he was being censored by Malaysia's media.

"If the trial is again postponed, it will be proved it is really a political issue," he said.

"She was murdered because she knows too much," Shaariibuu said, although he declined to elaborate.

Analysts view the High Court trial as a key test of Malaysia's judicial and political integrity because of Abdul Razak's connections to the government.

Other developments, such as the replacement of the trial judge in March and allegations by an ex-defence lawyer of third party interference in the case, have prompted calls for inquiries.

Former deputy prime minister Anwar Ibrahim Thursday said the changes in the judge and the prosecutor, as well as the defence lawyer's allegations raised concerns about the fairness of the trial.

The changes have already prompted speculation that charges against Abdul Razak and at least one of the police officers will be dropped when the trial recommences, he said.

"These manoeuvres ... will regrettably undermine public expectations that this trial will be fully transparent," Anwar told reporters.