Video-sharing app TikTok has been hit with a class action lawsuit in the US that claims it transferred "vast quantities" of user data to China.
The lawsuit accuses the company of "surreptitiously" taking content without user consent.
Owned by Beijing-based ByteDance, TikTok has built up a keen US fan base.
TikTok, which is thought to have about half a billion active users worldwide, has previously said it does not store US data on Chinese servers.
However, the platform is facing mounting pressure in North America over data collection and censorship concerns.
The lawsuit filed in a Californian court last week claims TikTok transferred to servers in China vast quantities of private and personally-identifiable user data".
It alleges the data could be used to identify, profile and track users in the US "now and in the future".
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