Directorate of Revenue Intelligence (DRI) officials intercepted four passengers when they arrived at the Egmore Railway Station by the Rameswaram-Chennai Sethu express on Thursday, it said.

During questioning, the passengers admitted that they had gold bars concealed around their waist in specially designed pouches, the DRI statement said.

They were carrying 123 gold bars weighing 23.1 kg. The value of the bars is about Rs 7 crore, it said.

“The passengers admitted that the gold bars had been smuggled into India from Sri Lanka, and that the gold bars had been given to them by certain persons based in Ramanathapuram with instructions to deliver at Chennai for a commission,” the statement said.

On February 27, the DRI had seized 19.27 kg of smuggled gold from two persons on a motorcycle near Jegathapattinam (a coastal village near Mimisal in Tamil Nadu). The duo were later arrested.

In another case, the agency had seized 11 kg gold smuggled into the country through Tiruchirapalli airport.

The gold had been concealed in the smoking room of the airport's arrival hall, and was retrieved by a housekeeping staff of the airport who would use his employee pass to escape customs unnoticed and hand it over to other gang members for transporting it to Chennai, it said.

“An entire chain of gang members was arrested including air passengers who smuggled in the gold, the housekeeping attendant who retrieved it, the organiser in Trichy, gang members who transported it and a merchant in Chennai who was to eventually receive the smuggled gold,” the statement said.

In the 2017-18 fiscal, DRI Chennai has seized 193 kg of gold, valued at Rs 57 crore, in 31 cases and arrested 53 people.

More than half of the gold seized this year (103 kilograms) was smuggled by boats from Sri Lanka through the Tamil Nadu coast, in connection to this 22 people were arrested, the DRI said.