The Central Bureau of Investigation (CBI) on Monday detained a foreign national and mastermind of Joint Entrance Examination (JEE) Main 2021 paper leak case. According to sources, CBI is interrogating a foreign national after taking him over from Bureau of Immigration (BoI) at Indira Gandhi International Airport in Delhi which had detained this Russian national on his arrival from Kazakhstan based on Look out Circular (LOC) issed by CBI in Software tampering case of JEE Mains-2021. He was the main hacker in the case.”He was the mastermind in the case who has hacked the software of examination. We are questioning him to ascertain the role of the other people involved in the case and identifying the people who were giving instructions to him,” said a senior CBI official. The accused has been identified as Mikhail Shargin, a Russian national.