(Yicai Global) July 5 -- China’s internet watchdog has launched security investigations into three more internet platforms, after opening a review of ride-hailing giant Didi Chuxing on July 2.

The Cyberspace Administration of China said today that it will also probe Yunmanman and Huochebang, two truck-hailing platforms under Full Truck Alliance, and online recruiter Boss Zhipin to prevent data security risks and safeguard national security.

The CAC ordered app stores to remove Didi yesterday, after the ride-hailer was found to illegally collect user data. Yunmanman, Huochebang and Boss Zhipin are still available in major app stores, but new user registrations are suspended to prevent any risks from spreading, the regulator said.

Full Truck [NYSE: YMM] and Kanzhun [NASDAQ: BZ], the company behind Boss Zhipin, listed in the United States last month, while Didi Global [NYSE: DIDI] debuted just last week. After the CAC opened its investigation, Didi’s shares closed 5.3 percent lower at USD15.53, giving it a market value of USD74.9 billion.

The CAC said the latest actions were taken based on the Measures for Cybersecurity Review, which took effect on June 1 last year. Twelve regulatory authorities, including the National Development and Reform Commission, the Ministry of Industry and Information Technology, and the Ministry of Public Security, jointly promulgated the measures in April 2020.

Full Truck and Kanzhun raised USD1.6 billion and USD912 million respectively from their initial public offerings. Alibaba-backed Didi, which listed on June 30, banked USD4.4 billion.

Editor: Futura Costaglione