518 calls for help: Police release 911 calls from Las Vegas mass shooting
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People run from the Route 91 Harvest country music festival after gun fire was heard on October 1, 2017 in Las Vegas, Nevada.

By Nathn O'Neal, KSNV

LAS VEGAS -- (KSNV) -- They are 518 voices – the calls for help during the deadliest mass shooting in modern U.S. history.

Hundreds of haunting 911 calls were released Wednesday from the night a gunman opened fire on a concert crowd on the Las Vegas Strip killing 58 people. In some of the calls, gunfire can be heard.

Each 911 call is a piece of the ever-evolving timeline of the shooting that lasted up to 11 minutes.

On October 1 at 10:06 p.m., Mandalay Bay security officer Jesus Campos was shot by the gunman on the 32nd floor, at which point he radioed the security office alerting them to shots fired, according to LVMPD’s preliminary report.

The newly released 911 calls include what appears to be the first call made by Mandalay Bay security to 911. In an interview with police, Mandalay Bay security pointed out the trouble they faced getting through to 911 – staying on hold for “approximately two to five minutes.”

"This is Mandalay Bay security dispatch. We have an active shooter in Room 32-135," said one of the 911 calls, which runs about 20 minutes long. "We don't know what's going on inside the room. People down below say he's shooting outside the window because glass is shattering."

As the gunman unleashed hundreds of rounds on the crowd, LVMPD's 911 dispatchers were flooded with hundreds of calls.

FULL STORY: 518 calls for help: Police release 911 calls from Las Vegas mass shooting - KSNV