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".

Elon Musk's artificial intelligence company took action against its Grok chatbot on Wednesday, removing a post it had made praising Adolf Hitler in response to a question related to the deadly Texas Hill Country flood.