Three of them - Sushil Biswa, Ravi Thapa, and Roshan B Sangma- were residents of the state and another Sunny Mukherjee, a mastermind in the scam, hailed from Gujarat, a senior officer said.
"All four of them were involved in a conspiracy to cheat American citizens by impersonating as Internal Revenue Service agents and asking them to make payments to avoid punitive actions," East Khasi Hills district SP Davis N Marak said.
Last month, the police had issued lookout notice against four other suspects from Ahmedabad - Naimesh Kapadnekar, Paresh Aasani, Anish Rajan, and Pradip Kumar Harishchandra Maurya - in connection with the case.
Police are yet to estimate the magnitude of the scam but an officer said hundred of unsuspecting US citizens must have been duped by the gang before their operation was busted.
Disclaimer: No Business Standard Journalist was involved in creation of this content
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