The authorities arresting 91 suspected drug offenders in an islandwide operation last week discovered a four-year-old girl in a Chin Swee Road "drug den" with her mother and within reach of sachets of Ice (methamphetamine).

Her 22-year-old mother was one of six drug offenders arrested in the swoop, conducted on Tuesday by Central Narcotics Bureau (CNB) officers, the bureau said yesterday.

The woman and three men, aged 28, 29, and 31, are suspected of being drug abusers.

The other two arrested in the unit - a 29-year-old woman and a 34-year-old man - were suspected of trafficking drugs. All are Singaporeans except the 29-year-old suspected drug abuser, who is Malaysian.

About 26g of Ice, a digital weighing scale and some improvised drug-smoking apparatus were recovered from the unit, CNB said.

During the raid, officers found the 22-year-old woman's daughter with her.

"CNB officers noted that sachets of Ice were strewn around the unit, within possible reach of the child," the statement said.

CNB worked with the Ministry of Social and Family Development to ensure that the girl was placed under the care of an immediate family member. The bureau said she was being supported by services in the community.

The raids were conducted by CNB with the support of the Singapore Police Force from last Saturday to Thursday. Officers covered areas such as Bishan, Bukit Batok, Bukit Panjang, Choa Chu Kang, Marsiling, Punggol, Tampines, Teck Whye and Toa Payoh.

About 48g of Ice, 12g of heroin, 32g of cannabis, 23 Ecstasy tablets, 1g of ketamine, 1g of cocaine, 55 Erimin-5 tablets and three LSD stamps were seized.

Investigations into the drug activities of all the arrested people are ongoing, CNB said.

In February, a one-year-old boy was rescued from suspected drug traffickers after his caregiver left him in their care.

The toddler's caregiver, a 33-year-old Singaporean woman, was nabbed by officers around Kinta Road near Farrer Park MRT station, after she was found with a bag containing drugs.

His biological mother, who was on the run, has since been arrested. She was four months' pregnant and tested positive for drugs.