Thiruvananthapuram, Oct 4 (UNI) The Cyber Crime Police here have arrested a key member of a racket that allegedly duped a city-based doctor of over Rs 3.43 crore through an online investment scam promising high returns. The arrested accused, identified as Dhanush Narayanaswamy, a native of Bengaluru, was taken into custody following a coordinated investigation. Police said about Rs 1.2 crore was recovered from his bank account, believed to be part of the defrauded money. Narayanaswamy was later brought to Kerala and produced before the Thiruvananthapuram ACJM Court, which remanded him to police custody. Police sources said the crackdown comes amid a surge in cyber financial frauds, particularly those involving cryptocurrency and bogus online investment schemes across the state.