European Union regulators said Tuesday they are investigating whether Chinese platform TikTok violated the bloc's set of digital rules by failing to manage risks to Romania's presidential election, the Associated Press reported.

The European Commission stepped up its scrutiny of the popular video-sharing platform after Romania's supreme court overturned the results of the first round of voting, which resulted in the winner being a lesser-known candidate.

The court made its unprecedented decision after authorities in the European Union and the NATO member country declassified documents alleging that Russia “organized a large-scale campaign” on social media to promote candidate Calin Georgescu.

“Given the strong indications that foreign actors interfered in Romania's presidential election through TikTok, we are now thoroughly investigating whether TikTok violated the Digital Services Law by failing to address such risks. It must be very clear that all online platforms, including Tik Tok, must be held accountable in the EU,” European Commission head Ursula von der Leyen said in a statement.

Earlier, Romania's Constitutional Court annulled the results of the country's ongoing presidential election following allegations of Russian interference and ruled that the entire process should be rerun. Russia has denied any interference in the process.

The second round of the presidential election was to be held on December 8. Earlier, the European Union ordered the social network TikTok to freeze data related to the Romanian election․