Hong Kong authorities are working with their counterparts in Asia and America to track down the ringleaders of a multinational drug syndicate smuggling the party drug ketamine into the city from India. The move comes after customs officers arrested two tourists from Malaysia and found 4kg of the drug in their luggage when they arrived in Hong Kong on Thursday night - the fourth such haul at the airport in three months. 'The consignment, with a street value of $1.4 million, was packed in 28 bags of coffee in an attempt to disguise the haul,' Daniel Cheung Chi-kwong, head of customs' drug investigation group, said yesterday. 'The bags were made of aluminium foil. We believe the packaging was an attempt to escape detection by X-ray machines.' He said the two suspects had been identified after intelligence was exchanged with Southeast Asian law enforcement agencies. The pair were on their way to Hong Kong from Kuala Lumpur. The seizure is the fourth such haul since February, after Customs officers stepped up co-operation with mainland authorities and other law enforcers in the region.