Several shot at country music festival in Las Vegas

This is a breaking story and details are still developing. Stay with Newshub for up to the minute updates.

Shooting has broken out at an open-air country concert in Las Vegas on Sunday night (local time).

7:51pm: At least two people have been killed and dozens of others injured in the mass shooting, a hospital spokesperson has confirmed.

Reuters reports 24 people have been injured in the attack.

7:47pm: All flights in and out of Las Vegas' main airport have been halted due to the shooting.

Originally McCarran International Airport tweeted that several flights were being diverted, but has since confirmed all flights in and out of the airport have been "temporarily halted".

7:44pm: A number of people have been taken to hospital after the shooting, but it's still not known how many people have been injured or killed.

Witnesses report seeing as many as dozens of bodies as they fled the outdoor concert.

A spokesperson for the local University Medical Center has confirmed to the Associated Press the hospital has taken in "several" people with gunshot wounds, but didn't have any more details.

7:33pm: A tourist staying at the nearby MGM Grand Hotel says he originally thought the sound of the gunfire was a helicopter flying overhead.

Twitter user StreetBeetle told Newshub a friend, who used to be in the military, "knew instantly it was an automatic weapon".

He said there's "lots of panic" and the hotel has started sending people to the basement and to their rooms.

"It still seems very nuts. The MGM is now on lockdown and everyone is crying and panicking."

7:27pm: Las Vegas police have warned people to avoid the southern end of the strip and have closed part of Las Vegas Boulevard as they investigate.

At least one of those shot was a police officer, according to reports.

7:09pm: Video has emerged of the moment gunfire broke out at the country concert.

In the video, semi-automatic firing can be heard as the band plays. The band then breaks off as confusion begins to spread.

"Oh my God, something's happening. Get down, get down," one woman can be heard saying.

6:56pm: Concertgoers have been left in shock after the shooting.

Witnesses report seeing multiple injuries and fatalities as they fled their show.

6:45pm: Las Vegas police have confirmed they're investigating reports of an active shooter and has asked people to avoid the area.

6:32pm: Witnesses have reported multiple gunmen are firing from the Mandalay Bay Hotel and Casino, targeting those attending the Route 91 Harvest Festival nearby.

Video from the scene shows panic as people flee the shooting, with at least one person reportedly firing from a balcony.

It's unclear at this stage how many people have been injured.