Heavy smoke from wildfires blankets the US Midwest and Northeast, prompting evacuations

Heavy smoke from over 100 wildfires in Canada and the U.S. Midwest and Northeast has prompted evacuations in Minnesota's wilderness areas, with rangers working to evacuate thousands of campers. Unhealthy air conditions and extreme heat have led to closures of the Boundary Waters Canoe Area Wilderness, and rescue operations are underway to assist stranded campers.