Eleven suspects were nabbed for drug-related offences in a 12-hour joint enforcement operation which began on Tuesday morning.
A statement on Wednesday said that officers from the Singapore Police Force and the Central Narcotics Bureau carried out checks in public housing estates in Yishun, Ang Mo Kio, Hougang, Serangoon and Sengkang.
Drugs including one tablet of Erimin 5 as well as three packets and 10 straws of heroin, weighing about 10.3g, were seized as case exhibits.
Commander of Ang Mo Kio Police Division, Assistant Commissioner of Police Keok Tong San commended the officers. He added: "The police will continue to work closely with our enforcement counterparts to eradicate criminal activities and keep our streets safe."