Customs officers on Friday said they have seized what they believe to be HK$15 million worth of opium from a shipment that arrived from Pakistan by air in January.

Authorities said they had found around 5,600 plastic bottles filled with the suspected drug inside boxes that were declared to contain "herbal products".

Around 130kg of drugs were seized, and officials say investigations are ongoing.

Separately, authorities said they're also probing a case involving around HK$9.8 million worth of suspected ketamine that was seized at the airport last November

They said the drugs, weighing about 16kg, were hidden inside a parcel of cables from Belgium.