The heroin stock captured yesterday was the largest stock discovered on Sri Lankan waters to date and came from Pakistan, police say.

Eleven smugglers were arrested with 101kg of heroin in a ship off the southern seas. They were arrested last night by the Sri Lanka Navy in a joint operation involving the navy and the Police Narcotics Bureau.

Three other suspects were later arrested on Sri Lankan soil.

The police is conducting search operations in the captured ship with the aid of police dogs.