Police in Kenosha, Wisconsin, have launched an internal investigation after a video posted to social media appears to show an officer punching a Black man the officer mistakenly believed was involved in a hit-and-run crash. The incident is another blemish for the southeastern Wisconsin city, which endured days of protests three years ago after a white police officer shot Jacob Blake, who is Black, during a domestic disturbance. A white Illinois teenager named Kyle Rittenhouse shot three people during a night of unrest, killing two of them, an incident that became a flashpoint in the national debate over guns, vigilantism and racial injustice.