A gunman perched on the 32nd floor of a Las Vegas hotel-casino unleashed a hail 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.

More than 400 other victims were taken to the hospital, authorities said.

Montana elected officials react to the deadliest mass shooting in modern U.S. history.

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