A saluting gesture made by Elon Musk during his speech at President Donald Trump's inauguration celebration went viral on social media Monday afternoon, with many commentators expressing shock over its similarity to the "Heil Hitler" salute used by the Nazis.

After telling the audience "thank you" for reelecting Trump, Musk appeared to grab his chest and then forcefully extended his right arm fully into the air with an outstretched straight hand while making a grunting noise. He then turned around and repeated the gesture before touching his chest again and telling the crowd, "My heart goes out to you."