The police said that eight people were arrested in Borella with heroin in their possession.
Among those arrested were three women, the police media unit said today.
Following a day long raid along Magazine road in Borella on Friday the police arrested the suspects and seized the heroin.
All those arrested are residents of the area. The police are conducting further investigations.
Over the last few weeks the police have managed to arrest people from several areas with heroin in their possession.
Sri Lanka was recently noted as a hub in South Asia in heroin smuggling.