The arrested were identified as Md Mithu Mandal, 28, Md Shahidul Islam, 23, Md Sohail Rana (Hazrat), 40, and Rakibul Hasan Sagar, 20.
Sources at the BGB headquarters said a team of BGB-49 battalion led by its Assistant Director Mohammad Faruque Hossain stopped the four hundi traders when they were waiting to get on a Dhaka-bound bus from Hamidpur at around 11:50am.
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The hundi traders tried to flee but BGB members chased them and detained them.
BGB members frisked them and recovered 19 bundles US dollars each contain $10,000, worth Bangladeshi Tk1.6 crore.
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During preliminary interrogation, the men said that they have been involved in hundi trading and gold smugglings for a long time.