James Wilkinson For Dailymail.com

At least 20 people have been killed, including two police officers, and more than 100 injured after at least one gunman unloaded hundreds of rounds of ammo on a Las Vegas country music festival on Sunday night. There were 30,000 people in attendance at the event.

The Strip has been completely shut down after the sniper opened fire on the Route 91 Harvest country music festival from the 32nd floor of the Mandalay Bay resort and casino, located across a junction from the event.

Police confirmed that one suspect had been killed, and said at 12:38am that they believed there were no more shooters. Reports of shootings at other locations were unfounded, police said.

The shooter was killed after cops breached at the Mandalay Bay with explosives.

Police are now looking for a woman named Marilou Danley, whom they believe may have information that could help their investigation.

Speaking at a press conference early Monday morning, police said that they did not believe there were any more active shooters, and that claims of other explosive devices and suspicious cars were just rumors that emerged in the chaos after the shooting.

The shooter was not identified, except as a local man.

Police are now seeking a woman named Marilou Danley whom they believe to have information they need. She is described as an Asian woman, around four feet 11 inchest tall and weighing 111lbs.

She and the shooter are said to be roommates or companions; their precise relationship has not been explained.

They are also trying to locate two vehicles that they say belonged to the shooter: a Hyundai Tucson, license plate 114 B40, and a Chrysler Pacfica, license plate 19D 401.

They advised everyone in the area to continue sheltering in place until their safety can be guaranteed.

Two police officers who engaged the shooter have been hospitalized – one in critical condition, one less severely wounded. They have not been identified.

At least two other police officers are believed to have died in the crowds, having attended the music festival while off duty.

All of the ambulances in the area had been deployed to the location, and victims taken to two hospitals.