LUCKNOW, July 6 -- Uttar Pradesh Special Task Force (STF) on Saturday arrested four members of a gang here for duping a retired scientist of Rs.1.29 crore by digitally "arresting" him, an official note on Saturday.

The gang targeted Shukdev Nandi, 72, who retired as a scientist from the Indian Veterinary Research Institute (IVRI), Bareilly. It made a WhatsApp call to Nandi, displaying a fake caller ID with the Bengaluru City Police logo. They falsely claimed that a SIM card linked to his Aadhaar was used in a human trafficking and job scam, and that illegal funds had been deposited into his account, the note said.

A police official said one of the fraudsters identified himself as CBI officer Dayanayak. Over the next three days, Nandi wa...