France's data privacy watchdog CNIL said on Tuesday that it has opened a preliminary investigation into Chinese-owned video-sharing app TikTok after it received a complaint.
TikTok, owned by China's ByteDance, is already under investigation over privacy concerns by the United States, European Union and Dutch authorities.
"A complaint about TikTok was received in May. This complaint is now under investigation," a CNIL spokesman said, confirming a Bloomberg report.
He declined to elaborate on the nature of the complaint or the identity of the plaintiff.
“TikTok's top priority is protecting our users' privacy and safety. We are aware of CNIL's investigation and are fully cooperating with them,” TikTok said in a statement.
In the U.S., officials have said that TikTok poses a national security risk because of the personal data it handles.
President Donald Trump has threatened to ban TikTok and has given ByteDance 45 days to negotiate a sale of TikTok's U.S. operations to Microsoft.
In June, the European Data Protection Board (EDPB) said it would set up a task force to assess TikTok's activities across the bloc after a request from an EU lawmaker concerned about its data collection methods and security and privacy risks.
In May, the Dutch privacy watchdog said it would investigate how TikTok handles the data of millions of young users.