Four men have been arrested in Australia for importing 2.4 kilograms of pseudoephedrine from Fiji.
The substance is commonly used in the production of amphetamines.
The Australian Federal Police tracked the delivery of the chemical after customs screening found it concealed in scuba diving tanks at an international freight depot in Sydney.
The Australian Associated Press said the arrests were the culmination of a 13-month joint operation by the Australian Police and Customs and authorities in Fiji and Vanuatu.
Three search warrants have also been executed in Fiji and two people are helping the police with their inquiries.
Last week, police had discussed the dangers of South Pacific nations being used as staging points for amphetamine production at the South Pacific Chiefs of Police conference held in Brisbane.