Deadly Grand Canyon flooding knocks out critical water line amid race to find missing hikers

Severe flash flooding knocked out a central water line in the Grand Canyon this weekend, forcing the National Park Service to implement strict water restrictions amid an ongoing race to find missing hikers. NPS says it will implement stage four water restrictions beginning at 12:00 p.m. on Monday, saying the Saturday flooding caused "extensive damage to infrastructure," including the Transcanyon Waterline that supplies the park with water. Park officials say one person was killed and 15 may be m