Jakarta – Drug offenders account for 30 percent, or about 40,000 of the 132,000 Indonesian prisoners, the director general for correctional institutions, Untung Sugiyono, said Wednesday.

The drug offenders dominate prisons in major cities across the country, he said, after visiting prisons on Nusa Kambangan Island, Central Java, as part of the observance of World Anti-Narcotics Day.

In Java, the number of drug-related prisoners number 1,763, and only a few of them serve their jail terms on Nusa Kambangan, he said.

Nusa Kambangan Island is dreaded as a "prison island" for hard-core criminals and in the past was used to confine political prisoners, especially the now-defunct Indonesian Communist Party (PKI).