Update: Las Vegas tragedy is deadliest mass shooting in modern U.S. history

LAS VEGAS — A gunman perched on the 32nd floor of a Las Vegas casino unleashed a shower of bullets on an outdoor country music festival below, killing at least 50 people as tens of thousands of concertgoers screamed and ran for their lives, officials said Monday. It was the deadliest mass shooting in modern U.S. history.
More than 400 victims were taken to the hospital, authorities said.
SWAT officers using explosives stormed the gunman’s hotel room and found he had killed himself, a