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 by posing as CBI officers, 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 was coerced into transferring Rs 1.29 crore into multiple bank accounts. Realising that he had been duped, an FIR was registered at the Bareilly cybercrime police station on June 26 under sections 318(4), 319(2), 308(6), 61(2), and 111 of the Bharatiya Nyaya Sanhita (BNS) along with Section 66D of the IT Act. Following this, the STF was assigned to assist with the investigation, the press release stated. Acting on a tip-off, the STF team arrested the four suspects on Friday . Those arrested were identified as Shyam Kumar (Sitapur), Rajneesh Dwivedi and Sudhir Kumar Chaurasia (Gonda), and Mahendra Pratap Singh alias Chandan Singh (Balrampur). All were currently living in Lucknow....