PATNA, Jan. 16 -- The CBI has officially taken over the investigations of two cases registered by Bihar's EoU into alleged illegal telephone exchanges operating from Bhojpur and Supaul districts, officials aware of the matter said on Thursday. The economic offences wing (EoU) with the help of telecom department busted an international cyber fraud racket, arresting of six men from Supaul and Vaishali and seizure of eight SIM box devices, over 1,300 SIM cards, passbook, ATM cards and credit cards on July 20, 2025. Later EoU registered an FIR against 19 people, including mastermind Harsit Kumar Mishra (Supaul), Mohd Sultan, Mohd Sakil, Mohd Anvarul, Mohd Nausad Alam, Mukesh Kumar Singh (Vaishali), Rehan Khan (Delhi), Mister Cross (Odisha), Sumit Sah, Sujit Sah and Pintu Sah (all three from Pakur, Jharkhand), PoS owners Pankaj Mobile, Mukesh Telecom, Arjun, New Golden, Kolkata Mobile, Kiran Mobile and Golden Time (all from Vaishali). EoU raided Gauspur village under Karjain police station of Supaul, close to Indo-Nepal border. During investigation it found that the arrested persons had made over 5,100 calls between June 30 and July 2. They were supplying Indian SIM cards to fraudsters in countries like Thailand and Cambodia to target Indians. Harshit allegedly contacted cyber frauds of China, Vietnam, Cambodia through social media platforms. Officials close to the matter said, the international fraudsters offered Harshit money to run a SIM box. Later, Harshit got four SIM boxes each from China and Vietnam. SIM boxes help to run a parallel telephone exchange. The calls originated from Cambodia and Thailand as VoIP calls and were then converted into GSM calls using SIM cards and SIM boxes. The EoU found an account on the Crypto Exchange in the name of Harshit and evidence of credits and debits. Later on July 30, it raided Narayanpur village of Bhojpur district and registered FIR against four people including Mukesh Kumar Singh, PoS owners Rajaul Haque and Muktadir Hossain (both from Malda, West Bengal) and unknown persons....