Six Indian Smugglers has been arrested by Sri Lankan navy on Sunday in charge of allegedly smuggling 13.5 kg drugs into the country.

The Sri Lankan ship on patrol detected a suspicious movement at IMBL (International Maritime Boundary Line) from Indian waters to Sri Lankan territorial waters in the wee hours, the Sri Lankan navy said in a statement.

"The suspected boat movement was continuously monitored by the patrolling ship," the navy said.

The drug parcels believed to contain heroin were taken to the Kankesanthurai harbour.

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The six Indians will be handed over to the Kankesanthurai Police for further investigation, it said.

Sri Lankan Navy regularly arrests drug traffickers approaching to the northern waters of Sri Lanka, the statement added.