He said the investigation report will be completed within two weeks, as directed by Prime Minister Anwar Ibrahim, Berita Harian reported.

“We cannot reveal the results of the investigation so far because this information must be kept confidential first, but the report will be ready within two weeks,” he was quoted as saying.

“No officers have been sent to Australia because we have a customs attaché officer at the Malaysian high commission there and we are in contact with them.”

When asked if any customs department personnel may have colluded in the case, Sazali said the matter is still under investigation.

On Friday, Anwar called for the police to carry out an urgent investigation and report on the drug smuggling case within the next two weeks.

Anwar had questioned how a “sophisticated” system failed to detect the drugs in the consignment and how similar incidents were said to have occurred “12 to 16 times” over the years.

On March 13, a 336kg heroin shipment, with a street value of some A$268 million (RM790 million), was seized by Australian federal police in Brisbane, Queensland.

The drugs were hidden in two concrete blocks, each weighing about 500kg, marked as solar panel accessories inside a sea freight container, Australian police said.

Officers drilled into the concrete blocks and removed 960 packages, each containing about 350g of heroin.

Australian media reported it as being the biggest ever drug haul in Queensland and second biggest in the whole country.