New Delhi, Jan. 27 -- The European Union opened a formal investigation into Elon Musk's social media platform X on Monday after his artificial intelligence chatbot Grok spewed nonconsensual sexualized deepfake images on the platform.

European regulators also widened a separate, ongoing investigation into X's recommendation systems after the platform said it would switch to Grok's AI system to choose which posts users see.

The scrutiny from Brussels comes after Grok sparked a global backlash by allowing users through its AI image generation and editing capabilities to undress people, putting females in transparent bikinis or revealing clothing. Researchers said some images appeared to include children. Some governments banned the service...