As afrom a Las Vegas hotel room, early police radio reports paint a picture of chaos and horror as officers scrambled to ascertain what was happening, help gunshot victims and find the suspected shooter.
At least 59 people were killed and 527 wounded in thein U.S. history.
In the radio reports, obtained by CBS News from an open-source police scanner, officers are repeatedly asked to hold off on casualty reports because they have to find the active shooter first. At one point, an officer sounds so panicked that someone tells him to stay calm.
The radio reports capture the chaos as gunfire erupted.
"We have 40-50 people pinned against the wall, we're taking fire," an officer can be heard saying. "It's going right over our heads."
Another officer can be heard saying: "Multiple, multiple, multiple casualties at this tent!"
Another voice responds: "Stay calm. Please stay calm we are trying to get this set up."
At one point, police are warned to stay away from the "east side of the boulevard."
"Do not respond to the east side of the boulevard," an officer says. "We will be pinned down. The more who come over here, the more we will be pinned down."
Another officer can be heard reporting three badly wounded gunshot victims are in his car.
"Have three critical victims in my vehicle," the officer says. "I am taking them to Sunrise [hospital]. Do we have any vehicles that can assist me with traffic? They need to go now."
More than 400 victims were taken to area hospitals, authorities later said.
At one point, the police radio report references officers honing in on the suspected gunman at the Mandalay Bay casino-hotel.
"Eight-man element clearing casino floor and one SWAT team heading to 32nd floor," the voice says.
Police said Monday morning that the shooter, 64-year-old Stephen Craig Paddock, was found dead in a hotel room on the 32nd floor of the hotel. Authorities said he had as many as 10 firearms.