Three hikers die of heat illness in Grand Canyon as heat rises; North Kaibab Trail remains a major access route on the North Rim, a key path for Grand Canyon visitors.
Three hikers have died after heat-related illnesses on two Grand Canyon trails, with authorities urging inner-canyon hikers to avoid trails from 10 a.m. to 4 p.m. in the hottest hours. The National Park Service says investigations are ongoing and bodies have been taken to the local medical examiner.