Buoyed by the success of its initial crackdown on the so-called “Big 3” bitcoin exchanges, China’s central bank now intends to continue its on-site inspections of bitcoin companies in the country.

The Beijing branch of the People’s Bank of China (PBoC) announced on Wednesday that it will continue it inspections in collaboration with the Beijing Municipal Bureau of Finance and the Municipal Bureau of Industry and Commerce, while the central bank’s Department of Business Management will lead inspections on payment settlements, anti-money laundering, foreign currency management and financial security.

“Investigators also suggest that investors should pay attention to bitcoin platform transactions and activities such as legal compliance, market volatility, financial security and other risks, with careful participation in bitcoin investment activities,” the central bank said on its website.

Previously, PBoC officials conducted on-site visits at three of China’s biggest bitcoin exchanges—BTC China, OKCoin and Huobi—to check whether these companies’ operations have gone beyond the scope of their market. Investigators from the central bank said they discovered “irregularities” in the operations of the three companies.