Four people, including a 49-year-old woman, were arrested on Friday for their suspected involvement in drug trafficking. Central Narcotics Bureau (CNB) also seized about 2.12kg of heroin, 216g of "Ice" and 480 Erimin-5 tablets, worth more than $252,000.

CNB said yesterday that it had launched operations against two drug syndicates who were believed to have been distributing drugs here.

In the first operation, at about 6pm on Friday, CNB officers observed a meet-up between a suspected drug trafficker and a drug runner at a housing block in Ang Mo Kio Ave 4. The runner, a woman, was arrested shortly after at Ang Mo Kio St 61. Cash amounting to $8,200 was found on her.

Another group of officers also raided a flat in the housing block where the meet-up took place. A 42-year-old male Singaporean was arrested. Two bundles of heroin were also found inside the rubbish collection point on the ground floor for the suspected trafficker's unit. The man had allegedly disposed the bundles down the rubbish chute.

The drugs recovered were believed to be heroin weighing about 950g, with a street value of nearly $100,000.

On the same day, at about 6.25pm, another group of officers arrested two males, aged 56 and 57, who had just alighted from a car at the vicinity of Geylang Lorong 33. The officers found a bundle of heroin weighing about 922g from the centre console box of the vehicle.

Further raids at the two suspected drug offenders' hideout at a condominium in the same vicinity yielded about 253.6g of heroin, 216.3g of Ice, 480 Erimin-5 tablets and $4,500 cash. The street value of the drugs seized in this Geylang operation was more than $152,700.

According to CNB's statement on Saturday, the total amount of heroin seized from both operations could sustain more than 1,000 drug abusers for an entire week.

Investigations into the four Singaporean suspects are on-going.