The four persons, who entered India on May 8, were carrying valid travel document and later told police that they were 'carriers' of international currencies.
Acting on a tip-off, BSF personnel had yesterday detained the four Bangladeshis at Srimantapur checkpost in Sipaijala district of Tripura and recovered 2.3 lakh US dollar from their possession, the police said.
They were arrested after they were handed over to the police by the border guards.
"The Bangladeshi nationals have admitted to be 'carriers' of international currencies from one country to another," he said.
During preliminary interrogation, the accused said some people had given them the money in Kolkata for carrying it to some Bangladeshis in the neighbouring country.
Senior intelligence officials were interrogating them and exploring the possibility of their involvement with terror groups, the officer said.
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