The development comes after the DRI officers recently busted a gold smuggling syndicate at the airport.
The DRI had suspected connivance of airlines staff in facilitating gold smuggling.
As part of its operation, two persons were arrested on December 21, the statement said.
While Vijay Kumar alias Vijay Kumar Sharma was apprehended at the Lokpriya Gopinath Bordoloi Airport (LGBI) airport with 2.65 kgs of gold, another person Sanwarlal Sharma was held at the Indira Gandhi International Airport, Delhi by customs, it said.
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Both the accused were arrested and remanded to judicial custody by respective courts.
"In course of further investigations to unearth the smuggling syndicate, statements of six security staff of IndiGo airlines were recorded. All of them admitted that Rajeev Medhi, senior airport manager of IndiGo airlines, influenced them to clear the baggage carrying gold not only on December 21, but also on several previous occasions," the DRI said in the statement.
One of the accused, Vijay Kumar Sharma, also confirmed the role of Medhi in allowing safe passage to carry primary gold bars without valid documents in his checked-in baggage, even though it was identified and detected in baggage X-ray machine of IndiGo airlines, it said.
In view of his role in gold smuggling, Medhi was also arrested by DRI today, it added.