Audio recording sheds new light on Las Vegas shooting

In the chaos after Stephen Paddock opened fire on a hotel security guard, it appears the Mandalay Bay hotel didn't call the police until after the shooter took aim at concertgoers across the street.
2:06 | 10/11/17

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Transcript for Audio recording sheds new light on Las Vegas shooting
We turn next to dramatic new details from the massacre in las Vegas. An audio recording of a hotel maintenance working calling for help, after arriving on the 32nd floor of that hotel, where a security guard has been shot through that hotel door. You can hear the gunfire during that call for help. And here's ABC's chief investigative correspondent Brian Ross tonight. Reporter: The audio recording -- Security's up here. Repter: -- Sheds new light tonight on the moments after Stephen paddock opened fire down this hallway on a hotel security guard. Call the police, someone's fired a gun up here. Someone's fired a rifle on the 32nd floor down the hallway. Copy. Hey, it's on 32. Reporter: The man calling for help, a maintenance worker who found himself in that hallway too and radioed to hotel security. Security wants to know if you know a room? It's at the end of the hallway. I can't -- I can't tell you what room. He looked like he fired down the hallway when I got close to the door. Reporter: The maintenance worker, Stephen Schuck, says he wanted to make sure that help was on its way. Remain calm. You know, call it over the radio, so we can get police on their way as soon as possible. Reporter: According to the revised police timeline, it was about six minutes later, the shooter began to fire on the concert crowd. And tonight, a person who has reviewed the records tells ABC news hotel security did not call the police until after the rampage was already under way. Police say officers did not reach the 32nd floor until after the shooting had stopped. And Brian Ross back with us tonight. Brian, for people at home watching this, it's been confusing even for us, the timeline has changed from day-to-day. Initially they had said the security guard got there after the massacre, might have stopped the massacre. Then there was word from authorities he got there before the massacre even began. And now mgm, the owner of the hotel group saying they don't necessarily buy this new timeline, either. Reporter: That's right. The hotel says the recent timeline from police may not be accurate. We know the hotel is now working with authorities to straighten it out and police say to expect a new version of the time line on Friday. Brian, thank you. President trump tonight

This transcript has been automatically generated and may not be 100% accurate.

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