SINGAPORE - Four suspected drug offenders were arrested and more than $78,000 worth of heroin and Ice (methamphetamine) were seized in a Central Narcotics Bureau (CNB) operation on Monday (June 25).

Officers conducted three raids as part of the operation, during which they uncovered 991g of heroin, about 90g of Ice and a bottle of methadone, CNB said on Tuesday.

All four people arrested are Singaporeans.

During the operation on Monday night, CNB conducted an observation on two suspected drug traffickers near Circuit Road. Officers arrested the two men, aged 38 and 44, when their vehicle came to a stop at the junction of the Pan-Island Expressway leading into Paya Lebar Road.

Officers recovered 938g of heroin from their vehicle, CNB said.

CNB then conducted a follow-up raid at the Circuit Road hideout of the 38-year-old man. Officers found about 48g of heroin, 90g of Ice and a bottle containing methadone in the unit.

Two other suspected drug offenders, a 36-year-old woman and a 48-year-old man, were arrested in the unit.

A further follow-up raid on the 38-year-old man's second hideout near Balam Road was conducted in the wee hours of Tuesday. Officers found about 5g of heroin and a small amount of Ice in the unit.

CNB said that 991g of heroin is enough to feed the addiction of about 470 abusers for a week.

Investigation into the drug activities of all suspects are ongoing.

The Misuse of Drugs Act provides for the death penalty if the amount of diamorphine (or pure heroin) trafficked exceeds 15g.