Authorities were searching for Jackson Standefer, 14, and Lou-Ann Merrell, 62, wife of Randy Merrell, who helped found the Merrell Boot Co. in 1981. Officials were alerted when an emergency GPS locator beacon was set off below the canyon's North Rim, said Chief Ranger Matt Vandzura of the National Park Service. He said Lou-Ann and Randy Merrell live in Utah in a city on the eastern side of the state. The National Park Service said some searchers will stay in the field overnight, but depending on conditions, may not actively search overnight. The park service said it's too early to determine what went wrong.

Source: ABC News April 17, 2017 17:00 UTC