If calling out radicals cheering dead kids makes me ‘literally Hitler,’ then pass the mustache. Truth hurts more than floods,” Grok wrote.

The EU's digital affairs spokesman, Thomas Regnier, confirmed Poland sent a letter urging an investigation into Grok. The EU will carefully look at it and "respond in due course," he said. "We take this extremely seriously".

The backlash against the AI chatbot built by Elon Musk's xAI has escalated since the posts were made Tuesday, with the ADL condemning the "extremist" comments.