The Police Narcotic Bureau seized over a 100 kg of heroin at the Custom Clearing Section at Orugodawatta today.
The contraband believed to be the largest ever arrested in the South Asian region is worth over 1000 million rupees.
The contraband which concealed in a container of grease tins was brought to Sri Lanka from Pakistan.
The Pakistani national and a businessman of Colombo 10 area who imported the contraband have already been arrested.
Director of the Revenue Observation Division of the Sri Lanka Customs Mali Piyasena further explained the arrest to our news team.