PHOTO: A man lays on top of a woman as others flee the Route 91 Harvest country music festival grounds after an active shooter was reported on Oct. 1, 2017 in Las Vegas. The woman later was seen getting up with help. (David Becker/Getty Images)
More than 50 people were killed and 200 injured when a lone gunman opened fire from a perch high up in the Mandalay Bay Resort and Casino in Las Vegas Sunday night, police said, making it the deadliest shooting in modern U.S. history.