Highland Park police hold a news conference on the Fourth of July parade shooting in which a gunman killed six people and injured dozens more. Read more: https://wapo.st/3nKPHRy. Subscribe to The Washington Post on YouTube: https://wapo.st/2QOdcqK Follow us: Twitter: https://twitter.com/washingtonpost Instagram: https://www.instagram.com/washingtonpost/ Facebook: https://www.facebook.com/washingtonpost/