SINGAPORE: A total of 136 suspected drug offenders were arrested during an islandwide operation by the Central Narcotics Bureau (CNB), the authority said in a news release on Friday (Mar 8). The 11-day operation, which ended on Friday morning, covered several areas, including Balestier, Bukit Merah, Geylang, Hougang, Jurong, Serangoon, Tampines and Woodlands.