Customs Director Mali Piyasena said the containers were seized on suspicion and sent to a container yard for checking, Xinhua reported.
He said that the documentation on the container indicated that it contained tins of grease. However when the tins were checked, customs officers found at least 100 kg of heroin inside.
The customs department said that two people, including a Pakistani national, had been arrested over the incident. This is the biggest heroin haul in Sri Lanka.
Indian enforcement agencies last year sounded an alert on drug cartels using India as a transit point for smuggling heroin to Sri Lanka, where the demand for heroin has doubled.
Sri Lanka has become a transit point for heroin smuggling in South Asia mostly by heroin dealers from Pakistan and India.
--IANS (Posted on 30-08-2013)