Shivraj Puri, the alleged mastermind behind a major fraud in the Citibank branch here, was arrested on Thursday.

Officials, however, declined to give details including from where he was arrested. He is likely to be produced before a court on Friday.

Police Commissioner S.S. Deswal estimated the size of the fraud to be about Rs. 300 crore. He said 40 teams were constituted to crack the case that involved alleged siphoning off funds taken as investments from high net worth individuals into a personal account of Puri and three of his accomplices.