UPDATE: More than 50 are dead, more than 500 are injured.
UPDATE: The Las Vegas Metropolitan Police Department reports that one suspect, Stephen Paddock, is down.
LAS VEGAS -- (KCPQ/AP) -- A Las Vegas hospital says at least two people are dead and 24 are injured – 12 critically – after a shooting at a country music festival late Sunday on the Las Vegas Strip.
Dozens of patrol vehicles descended on the Strip after authorities received reports of an active shooter near the Route 91 Harvest Festival.
Some officers took cover behind their vehicles while others carrying assault rifles ran into the Mandalay Bay Hotel and Casino.
University Medical Center spokeswoman Danita Cohen said the Las Vegas hospital is taking in "several" people with gunshot wounds. She didn't have any other immediate information.
Seattle's Emily Cantrell was at the concert.
"We heard what sounded like firecrackers and at first we laughed, then we looked down and there was a girl covered in blood right next to us," she told Q13 News' Jon Humbert late Sunday night.
Authorities shut down part of the Las Vegas Strip and Interstate 15.
Some flights destined for the McCarran International Airport were diverted due to the incident, and the airport was temporarily closed.
Concert-goers reported seeing muzzle flashes from the upper floors of the Mandalay Bay and the sound of what they described as automatic gun fire.
Witnesses say they saw multiple victims as they fled the gunfire raining down on the concert venue.
Some later huddled in the basement of the nearby Tropicana hotel-casino.