ByteDance Ltd.’s TikTok and Meta Platforms Inc. were added to the European Union’s list of tech firms being quizzed about how they are mitigating risks of possible illegal content spreading on their social media platforms amid the Israel-Hamas conflict.

The European Commission on Thursday said it sent formal requests for information to the two companies, further escalating EU attempts to rein in harmful content on social media a week after it asked Elon Musk’s X for similar answers.

The EU gave Meta and TikTok until October 25 to respond about how they’re tackling election disinformation and the spreading of “terrorist and violent content and hate speech respectively, following the Hamas-Israel conflict.” X’s answers were due Wednesday. Hamas has been designated a terrorist organization by the US and the EU.

Under the bloc’s new Digital Services Act, social media companies are required to hire more content moderators and use risk mitigation methods to decrease the spread of harmful content. Companies that fail to comply could face fines as high as six percent annual revenue or even be banned from the bloc if they repeatedly break the rules.

Meta, TikTok and X could face fines if they fail to respond to the commission.

EU internal market commissioner Thierry Breton sent warning letters to the companies earlier this month, warning them of their obligations to take the necessary content moderation measures under the DSA.