Hong Kong police are investigating allegations of fraud against cryptocurrency trading platform JPEX after investors complained of HK$1.3bn ($166m; £134m) in losses.
Eleven people, including popular influencers, were arrested this week after complaints filed by 2,000 people.
The case could be one of Hong Kong's biggest fraud cases, local media say.
It also tests new financial regulations as Hong Kong positions itself as a global hub for virtual assets.