SINGAPORE - A total of 103 suspected drug offenders have been nabbed by officers from the Central Narcotics Bureau in four-day islandwide operations which started on Monday.

Officers also seized drugs worth more than $85,000. The total haul included about 1kg of heroin, 18 grams of 'Ice', 290 grams of cannabis, Ecstasy and Erimin-5 tablets, and a small amount of ketamine, said the CNB in a news release on Friday.

The extensive drug bust was conducted with the support of officers from the Immigration and Checkpoints Authority, Singapore Civil Defence Force, and the police.

It was carried out in Ang Mo Kio, Bedok, Balestier, Boon Lay, Bukit Batok, Changi, Choa Chu Kang, Jalan Bukit Merah, Jurong West, Punggol and Woodlands. The anti-narcotics crackdown included a raid on illicit activities at a nightspot in Geylang on Thursday.

Two men travelling on a Malaysian-registered motorcycle into Singapore were arrested at Woodlands Checkpoint also on Thursday, after CNB officers found two bundles of heroin weighing about 950 grams in a rear seat cavity of the motorcycle. The 26 year-old rider and his 37 year-old pillion are both Malaysians.

Earlier on Monday, CNB officers arrested six suspected drug offenders in the vicinity of Jalan Bukit Merah. Officers also seized drugs including about 290 grams of cannabis, six Ecstasy tablets, small amounts of 'Ice' and heroin, as well as drug paraphernalia.

Investigations on the arrested individuals are ongoing. Under the law, drug traffickers face the death penalty if the amount of pure heroin, or diarmorphine, they bring in exceeds 15grams. That amount is equivalent to 1,250 straws, which is sufficient to feed the addiction of about 180 abusers for a week, said the CNB.