The detained person has been identified as Abdus Shukur (35), son of Tabir Rahman of Nutanpara village in Jibannagar upazila of Chuadanga.
Later, gold bars worth about Tk 51 lakh were recovered from him, the official said.
A case would be registered against the detainee, he said, adding that the gold bars would be handed over to the Darshana police.