TikTok, ByteDance Ltd.’s social media app, faces an investigation by the Dutch data protection authority amid concerns over the safety of children’s data.

The watchdog said Friday that “a huge number of Dutch children clearly love using TikTok” and that an investigation is needed to check privacy settings.

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The regulator will examine whether the information provided to children using the app “is easy to understand and adequately explains how their personal data is collected, processed and used,” Monique Verdier, deputy chairman of the Dutch authority said in a statement. They will also “look at whether parental consent is required for TikTok to collect, store and use children’s personal data.”

TikTok, owned by Beijing-based ByteDance, has been grappling with mounting questions from U.S. policy makers over whether it poses a national-security risk. It rejects the notion it’s controlled by the Chinese government or that user data is at risk.

TikTok’s “top priority is protecting our users’ privacy and safety, especially our younger users,” it said in an emailed statement. The company said it’s “fully cooperating” with the Dutch authority.

The results will be published later this year, the regulator said.

The 27-nation EU has one of the strictest data protection laws in the world. The General Data Protection Regulation, or GDPR, gives EU data protection authorities the power to fine companies as much as 4% of global annual sales for the most serious violations of people’s personal data.