Central Industrial Security Force (CISF) seized the gold bars worth Rs 2crore during the regular checking at Guwahati airport here on Sunday.
The passenger has been identified as Lalitha Liana from Mizoram was detained by CISF.
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CISF officials said the man handed him over the gold bars on his way to Guwahati from Aizawl.
The man was questioned and 39 gold bars, weighing over 6 kg, were seized from his checked-in luggage.
CISF sources said the further enquiry into the case is in progress.