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The CBI has detained an official posted in Gangtok and also a middleman, they said.
The FIR names 24 individuals including 16 officials who were allegedly issuing passports on the basis of forged documents to ineligible persons, including non-residents, in return for bribes, they said.
The searches are spread across Kolkata, Siliguri, Gangtok, and other locations, they said.