What started as a country music concert turned into a bloody massacre overnight, and it’s now being called the worst mass shooting in U.S. history. The shooting happened late Sunday night as 22,000 people gathered to watch country music artist Jason Aldean perform for the Route 91 Harvest Festival concert in the streets outside the Mandalay Bay Casino. At least 58 people were killed, and Las Vegas police report more than 515 people were injured and taken to area hospitals. The gunman has been

identified as 64-year-old Stephen Craig Paddock, a retiree with no criminal history, from Mesquite, Nevada. Police say he had as many as 23 guns with him, and he was killed during a confrontation as police raced to confront him on the 32nd floor of that casino. Authorities say the gunman attached what is called a “bump-stock” to two of his weapons, in effect converting semiautomatic firearms into fully automatic ones. READ MORE