Malaysian customs officials have arrested two Iranian men and seized heroin worth almost $16 million.
The drug, contained in 278 packages, was found in containers filled with bagged cement at Port Klang, Malaysia's busiest port and situated 38 km southwest of the capital Kuala Lumpur.
Investigations are now being made into the destination of the drugs.
In April, nine Iranians were arrested in Kuala Lumpur and more than 70 kg of methamphetamine seized, along with millions of dollars in foreign currency.
Police said then that the nine were believed to be using Malaysia as a base to supply drugs to Australia, New Zealand, Japan and Indonesia.