China's biggest ride-hailing company Didi Chuxing
China's biggest ride-hailing company Didi Chuxing has warned there will be an adverse impact on its revenues after its app was removed from Chinese stores.
China's internet regulator ordered app stores to stop offering Didi's app on Sunday.
It says the firm illegally collected users' personal data.
It comes just days after the tech giant began selling shares on the New York Stock Exchange.
The removal does not affect existing users, but will prevent new users registering on the country's biggest ride hailing platform.
"The company will strive to rectify any problems, improve its risk prevention awareness and technological capabilities, protect users' privacy and data security, and continue to provide secure and convenient services to its users," Didi said in a statement.
That came after the Cyberspace Administration of China (CAC) said: "After checks and verification, the Didi Chuxing app was found to be in serious violation of regulations in its collection and use of personal information."
Two days earlier, the CAC announced it was investigating the firm to protect "national security and the public interest", prompting Didi's shares to drop by 5.3%.
Didi gathers vast amounts of real-time data every day. It uses some of the data for autonomous driving technologies and traffic analysis.
Last week, China's answer to Uber made its debut on the New York Stock Exchange and at the end of Friday's trading had a market valuation of almost $74.5bn (£53.9bn).
The company raised $4.4bn in the Initial Public Offering (IPO), in what was the biggest listing in the US by a Chinese company since Alibaba's debut in 2014.
Didi Chuxing, a platform similar to Uber or Lyft, arranges more than 20 million rides in China every day, on average.
Founded in 2012, it is particularly popular in China's crowded cities. But it has expanded beyond China into 15 other markets.
In June, the company reported revenue of about 42.2bn yuan ($6.52bn) for the three months to the end of March, with the vast majority of that coming from its China mobility business.
China has recently moved to tighten up regulation of the country's large tech firms.
The investigation follows regulatory crackdowns on other tech firms, from Alibaba to food delivery service Meituan.
On Monday, the CAC also said that it plans to investigate the Chinese truck-hailing firm Full Truck Alliance (FTA).
Like Didi, FTA recently made its New York Stock Exchange debut, raising $1.6bn. It had a market valuation of more than $20bn at the end of trading on Friday.
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