A German tourist dropped dead seconds after a lightning strike at the Grand Canyon. Five other people in the woman's travel group were treated for minor injuries when the lightning hit the ground near where the group was standing. The flash didn't appear to directly strike anyone. Rangers were unable to revive the 64-year-old woman, who may have died of a heart attack, AP reports. Rangers warn that people should flee an area if thunder follows a lightning strike by 30 seconds or less, notes the St. George News. (More lightning stories.)