TikTok has said it will leave the Hong Kong market after China imposed a new security law on the city.
A spokesman told the BBC, "In light of recent events, we've decided to stop operations of the TikTok app in Hong Kong".
The company's exit from the city will come "within days," according to the Reuters news agency.
The short-form video app was launched by China-based ByteDance for users outside mainland China as part of a strategy to grow its global audience, reports BBC.
The tech company operates a similar short video sharing app in China called Douyin.
TikTok, now run by former Walt Disney executive Kevin Mayer, has said in the past that the app's user data is not stored in China.
The company has also said previously that it would not comply with any Chinese government requests to censor content or give access to its users' data, nor has it ever been asked to do so.
However, the controversial national security law in Hong Kong has given the city's authorities sweeping new powers, raising concerns about data privacy.
The legislation punishes what China describes broadly as secession, subversion, terrorism and collusion with foreign forces, with up to life in prison.
Critics say it erodes Hong Kong's freedoms as a semi-autonomous region, including freedom of speech.
Facebook, WhatsApp, Twitter, Google and Telegram have all announced this week that they are also making changes to their operations in Hong Kong after the new security law came into force last week.
The tech firms have said they are not processing data requests from the Hong Kong police while they assess the ongoing political changes in the city.