Authorities Looking for 2 Visitors Accused of Vandalizing Ancient Rock Formations at Lake Mead PEOPLEAid an Investigation or Report Something Suspicious in any National Park Service Site – Investigative Services (U.S National Park ServiceMen caught on camera destroying protected rock formations at Lake Mead National Recreation Area Fox 5 Las VegasTwo men topple boulders at Nevada national park as young girl watches in fear: ‘Daddy, don’t fall!’ New York Post