Highland Park (United States) (AFP) – A gunman armed with a high-powered rifle shot dead at least six people at a parade to mark US Independence Day in a wealthy Chicago suburb on Monday — the latest in a series of shocking mass shootings on a holiday meant to celebrate all things American. Police launched a manhunt in the city of Highland Park for the gunman, who was still on the loose, while authorities rushed to cancel July 4 celebrations there and in the nearby town of Evanston. Along the parade route, abandoned chairs and other belongings could be seen scattered after panicked spectators…