Massacre At Mandalay: Las Vegas Gunman Kills At Least 20 At Country Music Concert [VIDEO] The Daily Caller A gunman fired hundreds of rounds into a crowd gathered at a country music concert in Las Vegas Sunday night, killing at least 20 people and injuring more than 100, though authorities expect the number … Continue reading Massacre At Mandalay: Las Vegas Gunman Kills At Least 20 At Country Music Concert [VIDEO]