Ten Iranians, two Pakistanis, one Indian and one Singaporean were remanded in custody after appearing in a magistrate's court in Colombo on Saturday, national police spokesperson Ruwan Gunasekera said.
Drug bust: ANF sizes over 80kg drugs, seven arrested
"They have had Sri Lankans involved in this smuggling," Gunasekera said. "We are hopeful of arresting them (Sri Lankans) very soon."
Acting on a tip-off, police and the navy boarded the trawler off the south coast on Wednesday. They arrested the crew -- the 10 Iranians and one of the Pakistanis -- after discovering the 110 kilograms (242 pounds) of heroin that authorities estimate was worth 1.1 billion rupees ($7.5 million).
"A Singapore national and an Indian were (also) arrested following a car chase on Saturday," he said adding that the other Pakistani was detained at a house in Sri Lanka that was allegedly used as a base for drug-smuggling.
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The seizure is the biggest since August 2013 when police found 260 kilograms of heroin hidden in a shipping container that had come from Pakistan.
Sri Lankan authorities have said that such large quantities of heroin suggest that Colombo is being used as a transit centre. Narcotics could be reshipped to the Far East, according to authorities.
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