An investigation against an online gaming app has led the Enforcement Directorate (ED) to a Rs 400-crore fraud involving Chinese nationals. The ED has now frozen the accounts of some Chinese nationals linked to the online gaming app, Fiewin. A sum of about Rs 25 crore has been frozen. Earlier, four Indians who allegedly supported the Chinese nationals in the fraud were arrested by officials of ED in Kolkata. The ED was supported by Binance, which operates the world's largest cryptocurrency exchange, in its probe.