>>> (( "call the police.
Someone's firing a gun up here.
Someone's firing a rifle on the 32nd floor down the hallway."
Security wants to know if you know a room."
"it's at the end of the hallway.
I can't tell you what room.
He looked like he fired down the hallway when i got close to the door."
So it's down the 100 hallway, correct?"
"security's up here.")) ((christianne klein)) >>> newly released audio... from inside mandalay bay... as the gunman was opening fire from inside a room on the 32nd floor.
Thanks for joining us tonight at six... i'm christianne klein.
((denise valdez)) >> and i'm denise valdez.
In that audio you can hear the gunshots going off... as a hotel employee alerts hotel security about the gunfire.
((christianne klein)) >> in new reports tonight from abc news... hotel security didn't call 9-1-1... after finding out a guard... jesus campos... was shot outside gunman stephen paddock's room.
Remember... in the updated timeline metro police released this week... there were six minutes between campos being shot... and paddock first opening fire on the route 91 crowd.
((denise valdez)) >> also new tonight... we're hearing from one of campos' coworkers... who described the chaos that unfolded inside mandalay bay that night.
Cnn's kate bolduan has more.
Kate bolduan: "there's also new details on the las vegas massacre - the timeline of how the massacre played out.
That is raising new questions about what really happened that very tragic night.
And a new person who was there that night is speaking out.
Hotel worker, steven shuck.
He went up to the 32nd floor, because there was a door alarm that was going off that night.
He came upon the security guard, jesus campos, who was shot in the hallway and jesus campos warned him to take cover.
Listen to him."
Stephen schuck / hotel employee: "i was about a third of the way down the hallway and i started to hear shots go off.
They were not in the hallway yet.
And as soon as they stopped, i saw jesus pop out, because the doors in the hallway are set back about a foot.
And he popped out and he yelled at me to take cover.
And as soon as i started to go to a door to my left, the rounds started coming down the hallway.
I could feel them pass right behind my head.
Something hit me in the back and i took cover.
I tried to think how i could get to jesus, because i could see that he was shot in the leg."
((christianne klein)) >>> a mass